Answer:
Step-by-step explanation:
-3x=16+5
-3x=21
x=21/-3
x= -7
The perimeter of a rectangle is the sum of its sides, which are two widths and two lengths:

Since the length is twice the width, we have
, and the formula for the perimeter becomes

So, we have

Answer:
$0.84
Step-by-step explanation:
1. find total cost of both the pen and paper
2. find the amount Sally spent
3. find cost of ruler
Answer:
85/1
Step-by-step explanation:
because both numbers are divisible by 16