Brock exercises every day. The function E = 15m + 5 represents the number of sit-ups he can do in m minutes. After drinking a new sports drink to stay hydrated, he finds that he can increase the number of sit-ups per minute by a factor of 3, represented by the function S = 3E. Which function represents the number of sit-ups he can do after drinking the sports drink?

a) justify

step-by-step explanation:

justifying is just part of everyday life. justify kind of means proof so i think the answer is a) justify.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

2(2x + 3) = -4 + 2(2x + 5)

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 6

4x - 6 + 6 = 4x - 6 + 6

4x = 4x

x = x

unlimited solutions.