The sum of the ages of andy and derek is 50. in 5 years time, the age of derek will be four times that of andy now. how old is each boy

Which system of linear inequalites is represented by the graph?

Which is the correct excel formula for the 80th percentile of a distribution that is n(475, 33)? =norm.dist(80,475,33,1) =norm.inv(0.80,475,33) =norm.s.inv((80-475)/33)?

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