Use words to explain why the two equations below are equivalent 7x - 9 = 12
3(2x - 5) = 6 - x

These equations are equivalent because after you solve the equation the answer are the same. For example 2+2 and 3+1 are equivalent. They both equal four. In these problems are x=3 and x=3.5 they are the same beause of the answer on problem 2 6-x. That makes them both have the same answer

Step-by-step explanation:

7x-9=12

   +9=+9

   7x=21

   /7=/7

   x=3                                

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

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