HW3

Homework 3

Will TV dumb you down? Here are two sets of data, a graph and a table.

(Taken from http:// http://www.economist.com/node/9527126)

Country Estimated Av IQ Country Estimated Av IQ United States 98 Canada 97 Turkey 90 Britain 100 Italy 102 Denmark 98 Belgium 100 Finland 97 Japan 105 Austria 102 Spain 99 New Zealand 100 Portugal 99 Ireland 93 Australia 98 Switzerland 101 South Korea 106 Sweden 101

(Taken from http://www.sq.4mg.com/NationIQ.htm)

1. Use the data from the two sources to make one table and then make a scatter plot that compares hours of TV viewing with intelligence. Consider this evidence and use it in deciding whether TV watching fries your brain or not. Be sure you write a justification for your decision that is consistent with your interpretation of this data.

2. (Review) A Giant Flag:

A local protest group is designing a giant flag to display over their headquarters. Their latest design is below.

x+2 2x+3 x

Yellow

x–2

White

Red

x

Blue

a. Write an algebraic expression that represents the area of the flag.

b. They decided the area should be 260 square feet. What would the dimensions of the flag have to be? Use what you wrote in part a) to write an equation and solve it.

c. They want to buy a fringe to fit exactly around the edges. Use your result from part b) to figure out how much fringe they need.

d. They have exactly 90 square feet of the red material. Will they have enough red material for that part of the flag?