exam Maths Puzzle Numerical Ability

if you have 4 with a small 4 upper right...do you multiply?
example number two : 5^4 x 3^2 is ???? every way I work them it is some huge number as an answer and I do not know what I am doing wrong
help....

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exam Other Question

Simplify: (x^4 + 10x^3 - 23x - 348x - 540) / (x + 5) Two boys on bikes start at the same time at the same place and travel opposite directions. One travels at the rate of 10 miles per hour and the other at the rate of 6 miles per hour. In how many hours will they be 72 miles apart?