How do you subtract a positive and a negative number

Subtracting a negative is making the number less negative so you add. 7-(-7)=7+7=14

Step-by-step explanation:

Example : 2 -(-2) Note: - * - = +

2 + 2 = 4

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk