exam Maths Puzzle Numerical Ability

i need help on four problems y - 57=72 i need the inverse operation of that,
the inverse operation of x over 2 (like a fraction looks) =18, this is the last one i need the inverse

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exam Other Question

Bobby and Ricky are in a 10 lap race on a 1-mile oval track. Bobby averaging 90mph, has completed 2 laps just as Ricky gets his car on the track. What speed does rick have to average to be even with Bobby at the end of the 10th lap. hpw do you find the polnomial for the area l*w