Factor 15a + 21b.

Group of answer choices

3(15a + 21b)

3(5a + 7b)

3ab(5 + 7)

36ab

3(5a+7b)

Step-by-step explanation:

If you were to distribute this answer, you would arrive at 15a+21b.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.