What is the percentage decrease of 3 hours to 1/2 hours

Im new at this kind of math

3) Two planes leave Atlanta at 3 pm EST. One flies east and travels at a speed of 75 kilometers per hour slower than the other plane with is flying west. By 7 pm EST, the planes are 5460 kilometers apart.

Booker owes 85 video games. He has 3 shelves to put the games on. Each shelf can hold 40 games. How many more video games Does he have room for?

9 * 10 * 1 * 18 * 18?

Rewrite the expression without using grouping symbols 11 (23-x)

Convert each measure to degrees. Round answers to the nearest hundredth if needed. a.) π/9 b.) - 2π/3

Fiona is trying to prove that a pair of expressions are equivalent by using substitution. Which pair of expressions has the same value if she substitutes y = 3?

Find the equation of the vertical line through (7,-3)

Jess new pool holds 1,624 gallons of water he can fill the pool at a rate of 112 per hour how many hours will it take Jess to fill his pool

The opposite of the opposite of 17, or - (-17), is equivalent to which of the following?

In a right triangle, the side opposite angle has length 3.07 meters and the hypotenuse has length 7.89 meters. What is the sine of the angle?