Last week, Ralph’s gerbil drank 20 mL of water. This week he drank 16 mL of water. By what percent did the gerbil’s intake of water decrease?

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Solve the given system of equations. 2y= -x+9 , 3x-6= -15