exam Maths Puzzle Numerical Ability

radical 5X+4 = 1+ radical 3X+1

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exam Other Question

If f (X) = 5x-1, find the following
f (a-2)

Please help me solve this thank you
these are function notation problems A chemical solution contains 1% salt. How much salt is in 2.5ml of solution?
Would that be 1% x 2.5ml = .025?