Answer:

Step-by-step explanation:
since a=lw, the area is (x^2-3x+7)(x+4)
1. distribute parentheses 
2. apply +(-a)=-a rule 
3. Simplify
Steps to simplify:





4. Add like terms 
5. Add like terms 
Answer:
24 feet in lenght and 15 in width
Step-by-step explanation:
When it's 5th to the power you do the number by itself how many times the power is so the correct way would be
10×10×10×10×10
Answer:
Length = 11.25 and width = 3.75 inches.
Step-by-step explanation:
You must mean that the length is 3 times its width.
If the the width is x then the length is 3x inches.
Perimeter = 2*length + 2*width.
2(3x) + 2x = 30
6x + 2x = 30
8x = 30
x = 3.75.
3x = 11.25.
Here is the answer that Siri gave me