Discover Questions

Please help 9 1/12=k/9? The wheels of a car have a radius of 11 inches and are rotating at 600 rpm. Find the speed of the car in mph.? Determine where the curve given by xe^(xy)=1 has a horizontal tangent? Can some explain how 2x + 3 is a factor of 2x^3+5x^2-x-6? What is bismuth made out of? (sorry english very bad) but is it made out of other metals? this is very confusing?