Lisandro swims for 2 hours in a stream that has a current of 4 mph. He leaves his dock and swims upstream for 3 miles and then back to his dock. What is his swimming speed in still water?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

In right triangle xyz, the right angle is located at vertex y. the length of line segment xy is 12.4 cm. the length of line segment yz is 15.1 cm. which is the approximate measure of angle yzx? 34.8° 39.4° 50.6° 55.2°

What does the pair of equations y = 1, z = 8 represent? in other words, describe the set of points (x, y, z) such that y = 1 and z = 8?