Answer:
t=-2
Step-by-step explanation:
(t+9)20=140
Distribute the 20
20t +180 = 140
Subtract 180 from each side
20t +180-180 = 140-180
20t = -40
Divide by 20
20t/20 = -40/20
-2
(t+9)20 = 140
Open the bracket first by multiplying everything by 20.
(20×t) + (20×9) = 140
20t + 180 = 140
20t + 180 - 180 = 140 - 180
t = -2
