exam Maths Puzzle Numerical Ability

Given f(x) = 5x^ - 3x + 1, how would I find f(-2)?

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exam Other Question

Write an absolute-value equation that has 9 and 21 as its solution. Janet invested $31,000, part at 10% and part at 1%. If the total interest at the end of the year is $1,390, how much did she invest at 10%?

please help thanks