Find the circumference of a circle with a radius of 2.4 m

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny