Going against the current, a boat takes 7 hours to make a 120 mile trip. when the boat travels with the current on the return trip, it takes 4.5 hours. if x is the speed of the boat is still water and y is the speed of the current, which of the following system of equations could be used to solve the problem?

Parks is wearing several rubber bracelets one third of the bracelets are tie-dye 1/6 are blue and 1/3 of the remainder are camouflage if parks wears 2 camouflage bracelets how many bracelets does he have on

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?