A (11 and 1) I did it in 2ways (sum and product, discriminant)
Answer:

Step-by-step explanation:
The point slope form of a line is
where
. We write

Since the line is parallel to the line shown it will have the same slope. To find m, count the slope from each marked point on the graph. Count the rise then the run and create a fraction rise/run. The slope is 6/4 which simplifies to 3/2. Now substitute it for m.

Answer 10x
so the question doesn’t state the number of pages in these 10 books so i guess the answer would be 10x not a lot of info is given
Answer:
X=9
Step-by-step explanation:
perimeter =2L+2B
6= 2(x-6)+2(x-9)
6= 2x- 12+2x- 18
6= 4x-30
4x=30 + 6
4x=36
divide both sides by 4
x= 9