12=15(z-1/5) does anybody know how to solve this

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

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)