Two numbers are 10 units away in different directions from
their midpoint, m, on a number line. The product of the
numbers is -99.
Which equation can be used to find m, the midpoint of the
two numbers?
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(m - 5)(m + 5) = 99
(m - 10)(m + 10) = 99
m2 - 25 = -99
m2 - 100 = -99