Sophia has $20. she buys a hair band for $3.99, gum for $1.29, and a brush for $6.75. not including tax estimate how much change she should

step-by-step explanation:

let pq = qr = rs = x, and xz = y and zu = z.

if the horizontal lines are parallel, then corresponding segments are in proportion:

substitute:

therefore 3 = y = z.

xu = y + z → xu = 3 + 3 = 6

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