Identify the variation as direct, inverse, joint or combined.
f=4/r

What are the sotions to the quadratic equation 9x^2=4

Walking at a constant rate of 8 kilometers per hour, juan can cross a bridge in 6 minutes. what is the length of the bridge in meters?

One side of a rectangle is 7 centimeters shorter than six times the other side. find the length of the longer side if we also know that the perimeter of the rectangle is 266 centimeters.