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i dont undersdtand

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

Classify the following triangle check all that apply

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?