Write an expression for the sequence of oper add c to the difference of b and a

Do not simplify any part of the expression.

Simplify the expression below -3(10x+4y)+6(6x-2y)

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 : )

Given the equation negative 4 square root x minus 3 equals 12