The cost, c, of manufacturing and selling s units of a product is c=23x+70, and the corresponding revenue, r, is r=x^2-70. find the break-even value of x.

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?