F (x) = -x2 + 164x - 64, f(x) = -4x2 - 10x + 84, f(x) = 3x² + 24.

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists