A family eats at a resturaunt. The bill is $75. The family leaves a tip and spends $87 total. What percentage tip did they leave?

The base of a triangle is 8 1 3 meters and the height of the triangle is the fourth root of 16 meters meters. what is the area of the triangle?

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

Rewrite the equation x = 65 - 60p by factoring the side that contains the variable p.