What's the circumference and area of r=5m

I'm guessing you want the circumference and area of a circle that has a radius of 5 meters?
circumference = 2 * PI * r
circumference = 2 * PI * 5
circumference = 10 * PI = 31.14159 meters

area = PI * r^2
area = 3.14159 * 5^2
area = 3.14159 * 25
area = 78.53982 square meters

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!