David bought a book for 75 dollars and sold it for 25% less then the actually price how much money did david recieve

If you could answer these your a life saver

Benjamin is making bow ties. how many 1/2yards lomg bow ties can he make if he has 18 feet of fabric?

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove