She will know if 5(3x - 6) is equivalent to 15x - 30 if they end up to be equal to the same number.
5(3x - 6) Substitute 2 into x
5(3(2) - 6)
5(6 - 6) = 5(0) = 0
15x - 30
15(2) - 30
30 - 30 = 0
They both equal 0 when 2 is substituted in, so they are equivalent.
Also if you distributed 5 into (3x - 6) it would equal 15x - 30
Answer:
Step-by-step explanation:
Answer
96 inches cubed
Ok, same way of solving then. Just with a few more useless numbers. Take rectangular prism A, 6in x 3in x 3in, you will get 54in^3.
Then take prism B, 2in x 3in x 7in, you will get 42in^3.
Finally, take those two numbers, add them, and you end up with 96in^3
