exam Maths Puzzle Numerical Ability

Someone please show me how to do this.

Several values of the two function f and g are listed in the following tables

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exam Other Question

two cars leave town at the same time going in the same direction. One travles at 50 mph and the other travels at 70 mph. In how many hours will they be 60 miles apart? A crew can row 8km downstreat and back in 4.8 hours. If the rate of the current is 4 kph, find the rate of the crew in still water.


Oh please help me!!
Matt