Function f(x) is defined by f(x)= -x squared +2x+1 and the function g(x)=k, where k is a constant. When both are graphed in the xy-plane, f(x) and g(x) only intersect at the point (j, k). What is the value of k?

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?

The graph of a curve that passes the vertical line test is a:

What is the value of x? assume that the line is tangent to the circle.