exam Maths Puzzle Numerical Ability

I am doing my homework assignment and I come across this problem...
squareroot sign 28 + 4 squarroot sign 7 - 2 squareroot sign 24
I know I should be able to figure this out, but my brain is fried!!!

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exam Other Question
Subtract. Express your answer in simplest form.

5x/20 - x/20 Allen bought 20 stamps at the post in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cents did Allen buy?