Which equation represents a proportional relationship? A)y =
1
2
x
B)y =
1
2
x + 1
C)y =
1
2
x + 2
D)y =
1
2
x +
1
2

Christine went shopping and bought each of her six six nephews a? gift, either a video costing? $14.95 or a cd costing? $16.88. she spent ? $ 97.42 97.42 on the gifts. how many videos and how many cds did she? buy?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).