See the attached file for questioins

Systems of Equations; Inequalities 1.   Solve the equation |6x + 3| = 15       MACROBUTTON HTMLDirect A. x = –3 or x = 2 MACROBUTTON HTMLDirect B. x = 2 MACROBUTTON HTMLDirect C. x = –3 MACROBUTTON HTMLDirect D. x = 4 2.   When solving a system of equations using Cramer's Rule, if Dx = 0, Dy = –1, Dz = 1, and D = 0, then what can you conclude?       MACROBUTTON HTMLDirect A. The system has one solution, (0, –1, 1). MACROBUTTON HTMLDirect B. The system has one solution, (0, 0, 0). MACROBUTTON HTMLDirect C. The system is dependent. MACROBUTTON HTMLDirect D. The system is inconsistent.  Solve the inequality –2 (3 + x) < 4x + 4 < 8x. Give the result in set notation and graph it.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  MACROBUTTON HTMLDirect  Mark for review (Will be highlighted on the review page) 4.   Solve the system of equations 2x − 2y − 2z = 3, x + 4y − z = 2, and –2x − 8y + 2z = –4.       MACROBUTTON HTMLDirect A. There are infinitely many solutions, of the form (0.1, 0.1, –1.5). MACROBUTTON HTMLDirect B. There is no solution. MACROBUTTON HTMLDirect C. There are infinitely many solutions, of the form (x, 0.1, x −1.6). MACROBUTTON HTMLDirect D. There is one solution, (0.1, 0.1, –1.5). 5.   If the edge isn't included in the graph of an inequality, you should draw it as a/an _______ line.       MACROBUTTON HTMLDirect A. closed MACROBUTTON HTMLDirect B. dashed MACROBUTTON HTMLDirect C. open MACROBUTTON HTMLDirect D. solid What is the formula for the determinant of a 3 x 3 matrix ?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  7.   Solve the inequality |5x + 10| ≥ 15. Write the solution in interval notation and graph it.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  8.   Solve the equation |x| = 7.       MACROBUTTON HTMLDirect A. x = 7 or x = –7 MACROBUTTON HTMLDirect B. x = 7 MACROBUTTON HTMLDirect C. Undefined MACROBUTTON HTMLDirect D. x = –7   9.   Graph the following solution set: x ≤ y2 y ≥ x       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  10.   Aunt Jane's Pies had a tent at the county fair. Unfortunately their cash register broke, so they have no receipts. They know from counting their left over paper plates that they made 413 sales. They know from the cash box that they made $2,243. If they only sell two kinds of items at the fair tent, a piece of pie for $4 and pie á là mode for $7, help them figure out how many of each kind they sold.       MACROBUTTON HTMLDirect A. They sold 355 pieces of pie and 58 pies á là mode. MACROBUTTON HTMLDirect B. They sold 610 pieces of pie and 4683 pies á là mode. MACROBUTTON HTMLDirect C. The system of equations is inconsistent, and therefore their plate counting or money counting must have an error. MACROBUTTON HTMLDirect D. They sold 216 pieces of pie and 197 pies á là mode. 11.   Graph the inequality y ≥ –3.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    12.   Solve the system of equations x − 4y = –8 and –3x + 12y = 24.       MACROBUTTON HTMLDirect A. There is one solution, and it is (0, 2). MACROBUTTON HTMLDirect B. There is one solution, and it is (–4, 1). MACROBUTTON HTMLDirect C. There are infinitely many solutions. MACROBUTTON HTMLDirect D. There is no solution. 13.   Choose the correct ways to fill in the blanks in the following sentence. To solve a system of equations using the matrix method, use __________ to transform the augmented matrix into one with __________, then proceed to back-substitute.       MACROBUTTON HTMLDirect A. elementary row operations, zeros below the diagonal MACROBUTTON HTMLDirect B. the coefficient matrix, Gaussian elimination MACROBUTTON HTMLDirect C. the coefficient matrix, an inverse MACROBUTTON HTMLDirect D. multiplication and addition, zeros in its final column 14.   Find the equation of the boundary line in the graph below. Then give the inequality represented by the shaded area.        MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  15.   Find the value of the expression –|–18|.       MACROBUTTON HTMLDirect A. –18 MACROBUTTON HTMLDirect B. 0 MACROBUTTON HTMLDirect C. 18 MACROBUTTON HTMLDirect D. Undefined 16.   Are the two equations –6 + y = 2x and 2y − 4x = 12 dependent?       MACROBUTTON HTMLDirect A. Yes, because they have the same graph. MACROBUTTON HTMLDirect B. No, because they are not parallel. MACROBUTTON HTMLDirect C. No, because the equations are not written the same. MACROBUTTON HTMLDirect D. Yes, because both are the equations of straight lines. 17.   Solve the inequality |2x − 4| < 10. Write the solution in interval notation and graph it.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  18.   Graph the inequality y < 3x + 1.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    19.   Which of the following phrases correctly describes the graph of the system of equations  and y = 2 − x?       MACROBUTTON HTMLDirect A. The graph is of two lines that intersect at a single point. MACROBUTTON HTMLDirect B. The graph is of two lines that coincide. MACROBUTTON HTMLDirect C. The graph is of two parallel lines that do not intersect. MACROBUTTON HTMLDirect D. The graph is of a line and a parabola, which intersect at two points 20.   Graph the following solution set: y ≤ x − 1 y ≥ 2x       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    21.   Graph the solution set of x + 2y ≤ 3  x + 2y ≤ 4       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  22.   When solving the system of equations 6x + 2y = –1 and –x + 10y = 5 by Cramer's Rule, what are the values of D, Dx, and Dy?       MACROBUTTON HTMLDirect A. D = 58, Dx = –20, Dy = –29 MACROBUTTON HTMLDirect B. D = 58, Dx = 20, Dy = –28 MACROBUTTON HTMLDirect C. D = 62, Dx = 20, Dy = 28 MACROBUTTON HTMLDirect D. D = 62, Dx = –20, Dy = 29 23.   Solve the system of equations 2x − y + z = –7, x − 3y + 4z = –19, and –x + 4y − 3z = 18.       MACROBUTTON HTMLDirect A. There is one solution, (1, 2, 3). MACROBUTTON HTMLDirect B. There is one solution, (–1, 2, –3). MACROBUTTON HTMLDirect C. There is one solution, (1, –2, 3). MACROBUTTON HTMLDirect D. There is one solution, (–1, –2, –3). 24.   Graph the inequality 3x ≤ –4y − 4.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    25.   The matrix below is the augmented matrix of a system of three equations in the variables x and y. Solve for x and y.        MACROBUTTON HTMLDirect A. Infinitely many solutions MACROBUTTON HTMLDirect B. One solution (0, 9) MACROBUTTON HTMLDirect C. One solution,  MACROBUTTON HTMLDirect D. No solution Radicals and Rational Exponents 1.   What are the mean and standard deviation of the data – 6, 12, 2, – 4, 1, 6, 0, 3?       MACROBUTTON HTMLDirect A. The mean is 4.86 and the standard deviation is 5.63. MACROBUTTON HTMLDirect B. The mean is  and the standard deviation is approximately 5.6252. MACROBUTTON HTMLDirect C. The mean is  and the standard deviation is 5. MACROBUTTON HTMLDirect D. The mean is  and the standard deviation is approximately 5.6252.   2.   To solve  for x, begin with which of these steps?       MACROBUTTON HTMLDirect A. Isolate one radical expression. MACROBUTTON HTMLDirect B. Square both sides of the equation. MACROBUTTON HTMLDirect C. Combine the two like radicals, then square both sides. MACROBUTTON HTMLDirect D. Eliminate the negative in the second radical expression. 3.   Solve  for x.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  4.   What best describes the triangle whose corners are located at the points (1, 1), (2, 2), and (0, 16)?       MACROBUTTON HTMLDirect A. It is a right triangle. MACROBUTTON HTMLDirect B. None of the above. MACROBUTTON HTMLDirect C. It has area 22 square units. MACROBUTTON HTMLDirect D. It is isosceles. 5.   Which of these expressions is in simplified form?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    6.   Simplify .       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    7.   Which of the following best describes imaginary numbers?       MACROBUTTON HTMLDirect A. They are the complex numbers. MACROBUTTON HTMLDirect B. They are the values of expressions of the form  for various real numbers a, as long as a ≠ 0. MACROBUTTON HTMLDirect C. They consist of two values, the principal imaginary number i and its negative –i. MACROBUTTON HTMLDirect D. They are not numbers, but are useful in solving equations. 8.   Which of these points is 5 units away from the point (6, –1)?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    Simplify  assuming the variables represent non-negative numbers.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  10.   Simplify .       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  11.   Expand  and simplify. Assume c ≥ 0 and d ≥ 0.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  12.   Combine like radicals in .       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    13.   Simplify .       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    14.   Two children in nearby houses attempt to use walkie-talkies to communicate. The walkie-talkies reach one quarter of a mile (1320 feet). From one child's house to the other, the walk along the city sidewalks is as follows: Proceed 450 feet from the first house to the nearest corner, turn right 90° and proceed another 1050 feet. Are the children's houses within the 1320-foot range of one another? Choose the best answer.       MACROBUTTON HTMLDirect A. No, but if the turn were to the left instead, they would be within range. MACROBUTTON HTMLDirect B. Yes, as the distance formula indicates. MACROBUTTON HTMLDirect C. Yes, because city blocks are much smaller than one quarter of a mile. MACROBUTTON HTMLDirect D. No, because the distance is greater than 1320 feet.   15.   Simplify .       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    16.   Which of these expressions simplifies to ?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  17.   Which expression has the same value as 25½?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  18.   Simplify i23.       MACROBUTTON HTMLDirect A.  i MACROBUTTON HTMLDirect B. –i MACROBUTTON HTMLDirect C. 1 MACROBUTTON HTMLDirect D. –1 19.   Simplify (6 − i)(2 + i).       MACROBUTTON HTMLDirect A. 13 + 4i MACROBUTTON HTMLDirect B. 11 + 4i MACROBUTTON HTMLDirect C. 13 − 8i MACROBUTTON HTMLDirect D. 11 + 8i 20.   Which of these radical expressions simplifies to x?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  21.   Rationalize the denominator of  assuming x ≥ 0 and y ≥ 0.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  22.   Simplify  by rationalizing the denominator.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  23.   Solve  for x.       MACROBUTTON HTMLDirect A.  x = 2 or x = 8 MACROBUTTON HTMLDirect B. The two solutions for are complex numbers. MACROBUTTON HTMLDirect C.  x = 4 or x = –4 MACROBUTTON HTMLDirect D.  x = 2   24.   Solve  for x.       MACROBUTTON HTMLDirect A. 50 MACROBUTTON HTMLDirect B. 40 MACROBUTTON HTMLDirect C. 4 MACROBUTTON HTMLDirect D. –41 25.   Which of these phrases best describes the standard deviation?       MACROBUTTON HTMLDirect A. It increases as more measurements are taken. MACROBUTTON HTMLDirect B. It is a radical expression using n variables. MACROBUTTON HTMLDirect C. It is equal to the mean squared. MACROBUTTON HTMLDirect D. It is a measure of variability.   Polynomials and Polynomial Functions    Solve the equation        MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    2.   Completely factor the expression 7(x − y) − z(x − y).       MACROBUTTON HTMLDirect A. (x − y)(7 + z) MACROBUTTON HTMLDirect B. Prime MACROBUTTON HTMLDirect C. (x − y)2(7 − z)3 MACROBUTTON HTMLDirect D. (x − y)(7 − z) 3.   Completely factor the expression 16x4 − 81y4.       MACROBUTTON HTMLDirect A. (4x2 − 9y2)(4x2 + 9y2) MACROBUTTON HTMLDirect B. 0 MACROBUTTON HTMLDirect C. (2x + 3y)(2x − 3y)(4x2 + 9y2) MACROBUTTON HTMLDirect D. Prime 4.   Perform the indicated operations on the expression below. (5a3 + 3a - 2) - (4a3 + a2 + 5)       MACROBUTTON HTMLDirect A. 20a3 + 3a2 − 10 MACROBUTTON HTMLDirect B.  a3 − a2 + 3a − 7 MACROBUTTON HTMLDirect C. 3a6 − 7 MACROBUTTON HTMLDirect D.  a3 + a2 + 3 5.   Find the product of –3a3b(2a0b4 − 4a2b3)       MACROBUTTON HTMLDirect A. –6b4 + 12a6b3 MACROBUTTON HTMLDirect B. 12a5b4 − 6a3b5 MACROBUTTON HTMLDirect C. 14a5b4 − 6b5 MACROBUTTON HTMLDirect D. –6b5 + 14a5b4 6.   Completely factor the expression r2 − 2r + 1.       MACROBUTTON HTMLDirect A. (r + 1)(r − 1) MACROBUTTON HTMLDirect B. (r − 1)(r − 1) MACROBUTTON HTMLDirect C. Prime MACROBUTTON HTMLDirect D.  r(r − 2) + 1 7.   Graph the polynomial function f(x) = x3 − 1.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  8.   Completely factor the expression y2 + 12y + 35.       MACROBUTTON HTMLDirect A. (y + 7)(y + 5) MACROBUTTON HTMLDirect B. Prime MACROBUTTON HTMLDirect C. (y + 7)(y − 5) MACROBUTTON HTMLDirect D. (y − 7)(y − 5) 9.   Completely factor the expression 2a3 − 128.       MACROBUTTON HTMLDirect A. Prime MACROBUTTON HTMLDirect B. 2(a3 − 64) MACROBUTTON HTMLDirect C. 2(a − 4)3 MACROBUTTON HTMLDirect D. 2(a − 4)(a2 + 4a + 16) 10.   Solve the equation x2 + 4x − 45 = 0.       MACROBUTTON HTMLDirect A.  x = 9 and x = –5 MACROBUTTON HTMLDirect B.  x = –9 and x = 5 MACROBUTTON HTMLDirect C.  x = 15 and x = 30 MACROBUTTON HTMLDirect D. No solution 11.   Find the product of (2a + 3b)(2a − 3b).       MACROBUTTON HTMLDirect A. 4a2 + 12ab − 9b2 MACROBUTTON HTMLDirect B. 4a2 − 9b2 MACROBUTTON HTMLDirect C. 2a2 − 3b2 MACROBUTTON HTMLDirect D. 4a2 − 6b2 12.   Completely factor the expression 4q2 + 27r4.       MACROBUTTON HTMLDirect A. 27r4(4q2 + 1) MACROBUTTON HTMLDirect B. 4q(q + 27r) MACROBUTTON HTMLDirect C. Prime MACROBUTTON HTMLDirect D. 31q2r4 13.   Find the product of (x − 2y)2.       MACROBUTTON HTMLDirect A.  x2 + 4y2 MACROBUTTON HTMLDirect B.  x2 + 2xy + 4y2 MACROBUTTON HTMLDirect C.  x2 + 4xy + 4y2 MACROBUTTON HTMLDirect D.  x2 − 4xy + 4y2 14.   Completely factor the expression 16t3 − 50t2 + 36t.       MACROBUTTON HTMLDirect A. Prime MACROBUTTON HTMLDirect B. 2t(8t − 25t + 18) MACROBUTTON HTMLDirect C. 2t(8t − 9)(t − 2) MACROBUTTON HTMLDirect D. 2t(8t + 9)(t + 2) 15.   Find the value of the expression 2xy − x2y when x = 2 and y = 3.       MACROBUTTON HTMLDirect A. –24 MACROBUTTON HTMLDirect B. 6 MACROBUTTON HTMLDirect C. 0 MACROBUTTON HTMLDirect D. 24 16.   Solve the equation 3z3 − 300z = 0.       MACROBUTTON HTMLDirect A.  z = 0 MACROBUTTON HTMLDirect B.  z = –4 and z = 1 MACROBUTTON HTMLDirect C. Prime MACROBUTTON HTMLDirect D.  z = 0, z = 10, and z = –10 17.   Completely factor the expression a2 + 4b − ab − 4a.       MACROBUTTON HTMLDirect A. Prime MACROBUTTON HTMLDirect B. (a − b)(a − 4) MACROBUTTON HTMLDirect C. (a + b)(a + 4) MACROBUTTON HTMLDirect D. (a + b)(a − 4)   18.   Completely factor the expression 48u4v4 − 18u2v2 − 3u8v5.       MACROBUTTON HTMLDirect A. Nonfactorable MACROBUTTON HTMLDirect B. 3u2v2(16u2v2 − 6 − u6v3) MACROBUTTON HTMLDirect C.  u2v2(48u2v2 − 18 − 3u6v3) MACROBUTTON HTMLDirect D. 3(16u4v4 − 6u2v2 − u8v5) 19.   Simplify the expression 2ab4 − 3a2b2 − ab4 + a2b2.       MACROBUTTON HTMLDirect A.  a2b8 − a2b8 − 2a4b4 MACROBUTTON HTMLDirect B. 0 MACROBUTTON HTMLDirect C. 2a2b8 − 3a4b4 MACROBUTTON HTMLDirect D.  ab4 − 2a2b2 20.   Simplify the expression –2(4y2 + 3z3 + 5) + 3(2y2 − 5z3 + 3).       MACROBUTTON HTMLDirect A. 9z3 − 14y2 + 19 MACROBUTTON HTMLDirect B. –14y2z3 + 6y2 − 1 MACROBUTTON HTMLDirect C. –21z3 − 2y2 − 1 MACROBUTTON HTMLDirect D. 21z3 + 2y2 + 1 Rational Expressions 1.   Simplify the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    After t hours of work, Group A completes  of a job and Group B completes  of the same job. What expression represents the amount the two teams would complete after tseconds, working together?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  3.   Express this sentence as a formula: z varies directly with the square of s.       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  4.   Perform the indicated operations and simplify the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  5.   Solve this proportion for the variable:        MACROBUTTON HTMLDirect A.  x = 7 MACROBUTTON HTMLDirect B.  x = 10 MACROBUTTON HTMLDirect C.  x = –7 MACROBUTTON HTMLDirect D.  x = –10 6.   Perform the indicated operations and simplify the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.    Simplify the expression        MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  8.   Solve the following equation:         MACROBUTTON HTMLDirect A. { } MACROBUTTON HTMLDirect B.  t = –1 MACROBUTTON HTMLDirect C.  t = 1 MACROBUTTON HTMLDirect D.  t = 2 Divide the following expression:         MACROBUTTON HTMLDirect A. 5z2 + 7z MACROBUTTON HTMLDirect B. 3z2 + 7z + 3 and a remainder of –9 MACROBUTTON HTMLDirect C. 3z + 7 MACROBUTTON HTMLDirect D. 3z2 + 16z + 3 and a remainder of 6   10.   The total resistance R of two resistors in parallel is given by  where R1 is the resistance of the first and R2 the resistance of the second. Solve that equation for R1 and simplify.      MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.   11 Solve this proportion for the variable:        MACROBUTTON HTMLDirect A. y = 2 MACROBUTTON HTMLDirect B. y = 4 MACROBUTTON HTMLDirect C. y = –2 MACROBUTTON HTMLDirect D. y = –4 12.   Simplify .       MACROBUTTON HTMLDirect A. –a8b–7 MACROBUTTON HTMLDirect B. –a4b–7 MACROBUTTON HTMLDirect C. –a4b3 MACROBUTTON HTMLDirect D. –a8b3 13  Solve the following equation:         MACROBUTTON HTMLDirect A.  z = –4 MACROBUTTON HTMLDirect B.  z = 4 MACROBUTTON HTMLDirect C.  z = 6 MACROBUTTON HTMLDirect D.  z = –6 14.   Perform the indicated operations and simplify the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  15.   Factor and simplify .       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C. It is already fully simplified. MACROBUTTON HTMLDirect D.  16.   Which sum yields ?       MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  17.   Simplify the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  18.   Simplify the expression        MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  19.   Perform the indicated operations and simplify the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.  20.   Divide the following expression:         MACROBUTTON HTMLDirect A.  MACROBUTTON HTMLDirect B.  MACROBUTTON HTMLDirect C.  MACROBUTTON HTMLDirect D.