Answer:

Step-by-step explanation:

or

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Answer:
100-mn
Step-by-step explanation:
He bought m books for n dollars each to know the amount of the books he bought,it means m×n=mn
He had $100 intially so to determine the amount left
100-the amount spent
100-mn
Therefore the answer is 100-mn
Answer: 3/2
Step-by-step explanation:
(4,7.8) is your answer please give brainliest!