15% of what number is 72

If i purchase a product for $79.99 and two accessories for 9.99 and 7.00 how much will i owe after taxes applies 8.75%

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.

Leo takes 30 minutes to eat dinner, 15 minutes to change clothes, and 20 minutes to walk to practice.if leo needs to be at hockey practice at 7: 15pm,.what time does he need to begin