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Answer:
15.8 + 1.25z = $48.65
she buys 3 books.
step-by-step explanation:
total will equal to: $48.65
buys a bookmark so, it is constant = 1.25
buys z books for 15.8, so: 15.8z
solve:
15.8z + 1.25 = 48.65
15.8z = 48.65 - 1.25
15.8z = 47.4
z = 3