Answer:
If Regina wants a mean of 90, she needs to sell 94 books on the 5th day.
Answer:

Step-by-step explanation:
hello,
first of all we will study the quadratic expressions
we can write that, (the different answers provide good clues :-) )

and

so first of all as we cannot divide by 0 we need to take x different from 7, -12 and -30 and then we can write

hope this helps
I am currently doing this right now, make them equal each other, then follow what i do:
Yeth you are right.......