Question

7th grade pre algebra help?

Answer 1

 

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