Six times a number increased by 20 is four less than eight times the number. find the number

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?