Answer:
equation: 400 = 85 + 10x
answer: 400 = 85 + (10 x 31.5)
Step-by-step explanation:
i'm not sure if you wanted me to solve it, but i will :D if it has () around it that means circle it not parantheses
400 - 85 = 315
10 x (31) = 310
10 x (0.5) = 315
31 + 0.5 = 31.5