When 8 is added to a certain number and the sum is multiplied by 3, the result is 57. Find the number.​

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

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

Quickly multiply and simplify polynomials (x – 4) (x^2 – 5x – 6)