The volume of a sphere is 81π cubic centimeters. which equation can be used to solve for the radius of the sphere? a. 81π=4πr^2 b. 81π=4πr^3 c. 81π=4/3πr^3 d. 81π=4/3πr^2

Arestaurant gives out a scratch-off card to every customer. the probability that a customer will win a prize from a scratch-off card is 25%. design and conduct a simulation using random numbers to find the experimental probability that a customer will need more than 3 cards in order to win a prize. justify the model for your simulation, and conduct at least 10 trials.

How do you use the elimination method for this question? explain, because i really want to understand!

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.