Show that cos 2A - 1 over cos 2A + 1 is equal to -tan²A

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Divide: 1573 ÷ 7 = a) 222 r5 b) 223 r6 c) 224 r5 d) 224 r3

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?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab