An equation will remain equal if the same thing is done to both sides of the equation.
true
false

The answer to your question would be false not true.

b. 3.2 seconds

Step-by-step explanation:

Given the 2 functions:

h = 9t

h= -16t² + 60t

When the height is the same for both objects:

9t = -16t² + 60t

0 = -16t² + 60t - 9t

0 = -16t² + 51t

0 = t(-16t + 51)

which has two solutions:

t = 0

or

-16t + 51 = 0

51 = 16t

t = 51/16 = 3.2