exam Maths Puzzle Numerical Ability

what is the lowest common mutltiple of 8,28,48

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exam Other Question

Verify that each of the following is an identity:

1. csc(x)*sec(x) = cot(x)+tan(x)

3. cos(x)*cot(x)/sin(x) = csc(x)/sin(x)*sec^2(x)

4. csc^2(x)-cot^2(x)/sec^2(x) = cot^2(x
Please help. What am I doing here?
In exercise 30, if f(x)= 4x-3, find the following:
f(-1)