This is the area of a triangle
martin spent 6 hours on homework every day . what percentage of the day did martin spend doing homework ?
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We have the following:
To calculate the total money, you have to add the amounts that Paula won, as follows
Which means that in total they are $ 14.95
As long as your indexes are the same (which they are; they are all square roots) and you radicands are the same (which they are; they are all 11), then you can add or subtract. The rules for adding and subtracting radicals are more picky than multiplying or dividing. Just like adding fractions or combining like terms. Since all the square roots are the same we only have to worry about the numbers outside. In fact, it may help to factor out the sqrt 11: 
. The numbers subtract to give you -9. Therefore, the simplification is 