Find an equation that models a hyperbolic lens with a=8 units and foci that are 20 units apart. Assume that the center of the hyperbola is the origin and the transverse axis is vertical.

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.