exam Maths Puzzle Numerical Ability

I am trying to solve 15-2/2poweredx3+(12/4x3)
I have tried working it backwards, forwards doing work in parenthesis and bringing it down. Can some help?

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exam Other Question

I need to write a power function in form of y=ax^b passing through points (2,3)(6,7). This is what I've got so far:3=a*2^b a=3/2^b and 7=a*6^b

Then I've got 7/3 =3/2^b *6b. N IF YOU EARN $1 THE FIRST DAY OF WORK AND YOU SALARY IS DOUBLE EVERY DA1 (I.E. 1,2,4,8,16,32)HOW MUCH WILL YOU HAVE EARNED AFTER 30 DAYS?