<u><em>Solution:</em></u>
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Hope this helps!
Natural, Whole, and Integers. Hopefully I helped :)
180 is the degrees a straight line segment is. This means that
4x + 3x + 2x = 180.
Since these all have the same variable (x), then you can add the coefficients. (4,3,2)
9x = 180
180/9 = x
X = 20
$1602 would be the amount paid for 3 years of lessons.