Let y ∝ x^2.

a) what happens to y if x is doubled?

b) what happens to y if x is tripled?

c) what happens to y if x is halved?

d) what happens to y if x is quartered?

a) y is four times bigger

b) y is 9 times bigger

c) y is four times smaller

d) y is 16 times smaller

Step-by-step explanation:

Let's assume that our initial comparisson value is y0.

a) if x is doubled: :

 y is four times bigger

b) if x is tripled: :

 y is 9 times bigger

c) if x is halved: :

 y is 4 times smaller

d) if x is quartered: :

 y is 16 times smaller

about 0.75 hours

step-by-step explanation: