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+2 votes

Best answer

**1.) -5k-11=14 **

add +11 to both sides

-5k -11 + 11 = 14 + 11

-5k + 0 = 25

-5k = 25

divide both sides by 5

-k = 5

multiply both sides by -1 (-1 times -1 = +1)

-1*(-k) = 5*(-1)

k = -5

check your work

-5k-11=14

-5*(-5) -11 = 14

25 - 11 =14

14 = 14

**2.) 5(2t+4)=140**

divide both sides by 5

5(2t+4)/5 = 140/5

(2t + 4) = 28

2t + 4 = 28

subtract 4 from both sides

2t + 4 - 4 = 28 - 4

2t + 0 = 24

divide both sides by 2

2t/2 = 24 /2

t = 12

check work

5(2(12)+4)=140

5(24+4) = 140

5*28 = 140

140 = 140