exam Maths Puzzle Numerical Ability

I need help performing the indicated operation

f(x)=5x+15, g(x)=3x-1

I need to find (f og)(x)

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exam Other Question

A purse has P218 in P10, P5, and P1 Coins. There are 46 coins in all and there are 4 more P5 coins than the P10 coins. How many of each kind of coin are there?? hope you can help me... 1) 2log 1
2) log(2+3)
3) log AB^2