Rewrite Expressions in Different Forms Practice Test

A store offers a discount where customers pay $$0.85p$$ for an item originally priced at $$p$$ dollars. Which expression shows the relationship between the discount amount and the sale price?

The cost to rent a car is $$25 + 0.15m$$ dollars, where $$m$$ is miles driven. A customer wants to spend exactly $40. Which form of the equation $$25 + 0.15m = 40$$ makes it easiest to see how many miles they can drive?