exam Maths Puzzle Numerical Ability

please help to solve this one I now have grey hair
given f(x)=5x to the 2nd-3x+1, find f(-2). thank you

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exam Other Question

A farmer drives to town at 40km/h, spends 1.5 hours in town and returns home travelling at 30km/h. If he has been away from home a total of 5 hours, how far is hes farm from town? There are 210 students doing the morning exercise. Kinder, Grade Five, and grade six. There are 15 more grade five children than Kinder and 45 less grade six children than kinder. How many children from each grade are exercising?