Combining like terms algebra questions!

1) 13a + 5a
2) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 5(a + c)
3) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 4 + (x + y)
4) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 a(b + c)
5) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 3(2a + b)
6) If someone makes a telephone call and it costs $3.00 for the first minute plus .85 centers for each additional minute, how much would a 40 minute call cost?
7) Total = 5p + 3a + 8p + 1a + 9p + 2a
8) Identify the solution to 34 - 2z = 20
9) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 b^2 + c^2
10) 21x - 10x
11) 3(5am - 4)
12) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 6a + 7b + 8a + 2b
13) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 7(x +2y)
14) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 3, c = 4, b = 5, t = 0, x = 2, and y = 1 3(a + 2) + 5a
15) Simplify and evaluate for the given values of the variables. Use these values to substitute for the variable: a = 2, b = 3, c = -2, d=0 3a - 2 b