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7th grade pre algebra help?

0 votes

7th grade pre algebra help?

asked Mar 8, 2013 in PRE-ALGEBRA by futai Scholar

1 Answer

+1 vote

 

5(2t+ 4) = 140
distributive property a (b + c) = ab + ac
5 *2t + 5 *4 = 140
10t + 20 =140
subtraction property of equality if a = b then a - c = b - c
subtract 20 from each side
10t = 120
division property of equality if a = b then a /c = b / c (c not equal to 0)
divide each side by 10
t = 12

answered Mar 9, 2013 by John Lyn Pupil

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