N = x-7
2x = 5n-7
2x = 5(x-7)-7
2x=5x-35-7
-3x=-42
x=14
n=7
7 is the answer
Answer: Since you are finding the missing side of a rectangle, it is 3.
Step-by-step explanation:
Area of rectangle= (l)(w)
I am pretty sure it is (a) because 9 and 15 and 3 and 6 can be all divided by 3
1 is a and 2 is b hope its right
Number 3 would be C and number 4 would be D