Alan wants to make a metal cylinder (with length of 40 MM) melt down a solid metal sphere with a volume 36000mm^3 Calculate the length of the radius of the sphere

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Can someone me out here number 4 plz

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.