If you have a Scientific calculator you can type this in
Answer:
1. 18
2. -8
3. 1
4. 84
Step-by-step explanation:
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You simply put 40 over a hundred and 55 over n (which is the number were trying to find) so you do cross multiplication. 55 times a hundred and after you get the answer. You divide it by 40 and should get 137.5.