Darren is thinking of two numbers. Their sum is 21, and their product is 108. What is their positive difference?

*Solution to yesterday’s problem:*

First we need to find the circumference of the garden. The formula for circumference is . Substituting 20 for d, we get a circumference of 62.8319 feet. Each shrub is 6 inches in diameter, which means 2 shrubs will fit on one foot of the border. Double 62.8319 is 125.6638, so we can reasonably fit *125 shrubs* around the border of the garden.

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