Convert 1111 to denary.​

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

16x^2-16x=5 solve the equation by completing the square

How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60 mi/hr? the final answer is supposedly 21,609 but i have no idea how to get that, show work : )