What is the simplified form of the following expression? 7( cbrt(2x)- 3(cbrt16x)-3(cbrt8x)

Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?