Answer:
79 dollars
Step-by-step explanation:
a = 51 + b
Substitute the number of books, 28, he sold into the equation and solve for his earnings.
a = 51 + b
a = 51 + 28
a = 79
Your question seem to me non-understandable. Are they adding up together ?
or multiplying ?
Answer:
Step-by-step explanation:
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