Oil prices are projected to increase by 100% by next June. A quart of oil currently costs $2.45. What is the projected cost of a gallon of oil next June? Round your answer to the nearest hundredth.

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Need on this geometry question. explain how you did it.

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?