Determine the values of m and n for which the function f(x)= mx^4 + nx^3 + 68x^2-x-6 gives a remainder of zero when divided by (2x+1) and (4x-1). Explain your process.

Can some one me with these questions

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

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?