The inner ring of a hula hoop has a radius of 18 inches. which expression can be used to find its circumference, c, in inches?

a c = 18 × π

b c = (18)2 × π

c c = 2 × 18 × π

d c = 2 × (18)2 × π

Darian wants to build a regulation size pool table that is 9 feet in length.he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?