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

Simplify

c4power d five power ad-1 power 1 nine power c 3 power
How do you do this?
Use the expression r+0.12m to calculate the cost of renting a car. The basic rate is r. The miles driven is m.Determine the cost for the following.

The basic rate is $15.95.The car driven is 150 miles.