Answer:
15x + 2x can be written as 17x
Answer:
She made a mistake in Step 7.
Step-by-step explanation:
Step 1 through 6 are correct. Only from Step 6 to Step 7 the problem comes in: both sides of the equation are multiplied by x, however the x on the left side, by error, becomes 1. The correct state in Step 7 should look like this:

3 (inches) / 6 (hrs) = 1/2 (or 0.5) inches per hr <==
Answer:
B im pretty sure
Step-by-step explanation: