Answer:
Here, length is 8 in. Width is 4in. and height is (3+3+3)=9 in. Then use the formula.
A= 2wl+2hl+2hw
= 2×4×8 + 2×9×8+2×9×4
=280 inch²
Basically, the question is asking, what will happen if we increase 9 by 30%?
first, what is 30% of 9?

So, the increase will be by 2.7 days,
So the total amount will be 9+2.7=11.7 - this is the correct answer.
Here's a graph with 4 points shown.
Answer:
42
Step-by-step explanation:
solve for x first
4x+6+7x+15=120
11x+21=120
120-21=99
11x=99
x=9
plug in 9 for Ab equation
4x+6
4(9)+6=42.