1. My dog could paddle 11 miles downstream in 1 hour, but
it took him 1 hour to paddle 3 miles upstream. How fast
could the dog paddle in still water?

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =