I need help here and if you dont help you will be flaged

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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.