Each swing that susan builds requires $10 in hardware and $20 in wood. she uses the expression 10 + 20 to represent the total cost of building one swing.

which expression represents the total cost of building three swings?

a.
10 + (3 • 20)

b.
3 + (10 + 20)

c.
3 • (10 + 20)

d.
3 • 10 + 20

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Which table represents points on the graph of h(x) = 3√-x+2?