A shop advertises 25% off its prices in a sale a dress is 90% how much was it before the price reduction

What is the factored form of x2 − 4x − 5? (x + 5)(x − 1) (x + 5)(x + 1) (x − 5)(x − 1) (x − 5)(x + 1)

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

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