Sang-Jin has only quarters and nickels in her piggy bank. She has 66 coins in the bank with a value of $11.50.

How many quarters are in Sang-Jin's piggy bank?

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The square root of 5x equals 10

2.45 + = 3 What do I add to get to three. Is it 15?

X=2y+7 x=y+4 with substitution

Find all of the polar coordinates for (6, 31 degrees)

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Qasim and Alejandra both earn $15 an hour at their job. This week Alejandra worked three hours more than Qasim. If h represents the number of hours Qasim worked, and in total they earned $195, how many hours did each person work?