Answer:
20 + 10w = total cash saved
y = 0.5
x = 4 - y (0.5)
3.5 = 4 - 0.5
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3x - 10 = y
3(3.5) - 10 = y
10.5 - 10 = y
0.5 = y
a=x and b=9
(x+9)(x−9)
Explanation:
Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b)
