The radius is half of the diameter.
To find the circumference, use the equation C=2(pi)r or C=(pi)d.
r meaning radius. d meaning diameter.
(pi) is about 3.14 or 22/7
Your car's gas mileage is 15.5 miles to the gallon. On 55 miles of gas, you could drive 852.5 miles.
x = 5y - z
You can think that x and z are numbers, and we have one variable z.
x -5y = 5y - 5y - z
x - 5y = - z
(x - 5y)*(-1) = - z *(-1)
z = - x + 5y
