It costs $83 a day to rent a car plus a required fee for insurance. Suppose the total cost for renting the car for 7 days is $621. Write an equation to model this math situation. How much does the insurance cost? Which one is correct ?
a
581=621+b; b= -$40
b
621=83b+7; b= $7.41
c
621=83(7)+b; b= $40
d
621=83(7)+b; b= $1

How many different ways can you make change for $.50 using only nickels, dimes, and quarters?

Which equation represents the partial sum of the geometric series?

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 =