exam Maths Puzzle Numerical Ability

f(x)=3x-2 and g(x)=1/(2x+3)

solve for (f*g)(-2)

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exam Other Question

I need help simplifying and solving the following equation for H:

A= 1/2h(a+b).

I got to 2A=ha + hb. Is this right? How do I solve for H from here? Find the five-number summary of the following set of numbers.

0.16, 0.08, 0.27, 0.20, 0.22, 0.32, 0.25, 0.18, 0.28, 0.27

HELP can someone please explain this five number thing to me? I do not understand this either. :(