In which step did rena make the first error?

Step 4

Step-by-step explanation:

Rena made the first mistake in step 4 because she left the terms in the denominator, when in the previous step they were also in the denominator but raised to -1, which means that they should be in the numerator.

The right step 4 would be:

the function makes a strait line horizontally with no x intercept but a y intercept at 9.

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)