londyn87
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From the set {30, 42, 84}, use substitution to determine which value of x makes the equation true.

2,520 + x = 60

A.30

B.42

C.none of these

D.84

From the set 30 42 84 use substitution to determine which value of x makes the equation true 2520 x 60 A30 B42 Cnone of these D84 class=

Respuesta :

sqdancefan

Answer:

  42

Step-by-step explanation:

The correct choice is marked.

If you follow instructions, you will compute the quotient for each value in the set:

  2520 ÷ 30 = 84

  2520 ÷ 42 = 60 . . . . . the value we're looking for (we need go no further)

  2520 ÷ 84 = 30

__

The easier way to solve the problem is to multiply the equation by x/60, so you have ...

  2520 ÷ 60 = x

Then, you're doing one division instead of two or three.

  2520 ÷ 60 = 42 = x

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