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natima [27]
3 years ago
15

Which value of a from the set {16, 18, 20, 22} makes the equation 2(42 - a) = 48 true?

Mathematics
1 answer:
klio [65]3 years ago
7 0
a is equivalent to 18.

2(42 - a) = 48
2(42) + 2(-a) = 48     *distributive property of multiplication
84 - 2a = 48
-2a = 48 - 84
-2a = -36
-2a/-2 = -36/-2
a = 18

to check:
2(42-a)   = 48
2(42-18) = 48
2(24)      = 48
48          = 48
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