The value of y varies with x according to the equation y = kx2, where k > 0. When the value of x increases from 3 to 12, which of the following best describes the behavior of y?
A. It increases by 81.
B. It increases by 135.
C. It is multiplied by 4.
D. It is multiplied by 16.
Answer:D
The value of y varies with x according to the equation y = kx2, where k > 0. When the value of x increases from 3 to 12, which of the following best describes the behavior of y?
A. It increases by 81. B. It increases by 135. C. It is multiplied by 4. D. It is multiplied by 16.
Explanation: D