Which relation is a function?

a. x −2 0 0 2 4
y 4 3 4 4 6

b. x 3 5 7 10 14
y 9 6 9 2 3

c. x −3 2 2 4 6
y 2 1 8 5 3

d. x −6 −1 1 1 6
y 0 6 2 −3 4

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

What percent of the circle below is shaded?

What can each term of the equation be multiplied by to eliminate the fractions before solving? x – + 2x = + x 2 6 10 12