The copy machine in your office can produce 22400 copies in 7 hours. how many copies can it produce on 21 hours?

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?

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

Maurice has 54 fewer comic books than rebecca.they have 130 comic books together .how many comic books are in maurices collection ? how many comic books are in rebeccas collection