Answer:
b
Step-by-step explanation:
Find use the distributive property and bring down the ending result (21)
-3x-6=21
Next, add 6 on both sides and you should get:
-3x = 27
The last step is, you divide -3 from 27 and you end up with 9. So, the total answer is x = 9
Answer is 1.6 hours
T=D/S
_=86.4/54
1.6=86.4/54
(Hopes this helps)