Answer:
9
Step-by-step explanation:
using the formula (b/2)^2 you will divide 6 by 2 and square it. you will get 9. if you add 9 to the left side, you would have to add it on the right side as well (23+9=32). your answer should look like x^2+6x+9=32
1280 pages
You simply continue the pattern
40 × 2
80 × 2
160 × 2
320 × 2
640 × 2
= 1280
A
872 is the final answer
