(-7,1), (-3,-2) find the distance between pair of points

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*