What are the solutions of the quadratic equation x^2-16=0? ?

Can be factored into:
(x +4) * (x-4) = 0
x = -4 and
x = 4

You could factor that expression and get (x-4)(x+4) = 0.  Roots are {-4, 4}

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

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