How many ounces is in 1/2 of a gallon?

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution

Two lines intersect and two of the vertical angles measure 115°. what is the measure of the other two vertical angles? 65° 85° 90° 245°