The excursion boat travels 35km upstream and then returns to its starting point. The entire trip(both ways) took 4 hours and 48 minutes. If the speed of the boat in still water is 15km/hr and the current is 2.5km/hr how much longer is the trip upstream than the trip downstream. and
It takes a motorboat 50 minutes to travel upstream a distance of 10 miles, and 30 minutes to travel the same distance downstream. Find the rates, in miles per hour, of the boat in still water and of the current.

Runners run around the school's football field. the cross country coach determines that the width of the field is seventy yards shorter than the length. part a write an expression that represents the perimeter of the football field. let x represent the length of the football field. include parentheses in your expression. next, write an equivalent expression that does not include parentheses. what property or properties did you use to simplify? explain. part b the cross country coach later determines that the length of the football field is 120 yards. all students must run five laps. using your answer from part a, determine the actual number of yards that each athlete must run in the tryouts. in order to make the team, students must complete the laps in 6 minutes. how quickly must they run each lap?

Amanufacturer knows that their items have a normally distributed lifespan, with a mean if 9.1 years, and standard deviation of 2.9 years. if you randomly purchase one item, what is the probability it will last longer than 10 years?

The area of the rectangle shown is 2x^2-x-15 square units. what is the width of the rectangle?