Four pipes can fill a tank in 70 minutes. how long will it take to fill the tank with 7 pipes are used

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

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?