Ineed #3? ? math is not my strong suit

Factor the polynomial expression x6 – x3 – 20

Calculate the effective quarterly compound interest rate equivalent to a 1% of monthly compound interest rate.

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?