One acre of corn yields 20 gallons of ethanol. a bus gets 20 miles per gallon and travels 9000 miles in one year . how many acres of corn are needed to fuel the bus for a year ?

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?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

20 solve 2(4 x + 3) < 5 x + 21. a) { x | x < 9} b) { x | x > -5} c) { x | x > -9} d) { x | x < 5}