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White raven [17]
3 years ago
6

Beth had planned to run an average of 6 miles per hour in a race. She had a very good race and actually ran at an average of 7 m

iles per hour, finishing ten minutes sooner than if she had averaged 6 miles per hour. How long was the race? 6 miles? 7 miles? 18 miles? 60 miles? 70 miles?​
Mathematics
1 answer:
serg [7]3 years ago
7 0

Answer:

(x/7) = actual time

Step-by-step explanation:

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ANSWER: x=5/3, -1. Good luck. Hope this suffices.

Explanation for x=-1: |9x-3|=12. Lets take the absolute value brackets away for a sec. Add 3 to both sides 9x-3+3=-12+3, simplify: 9x=-9, divide both sides by nine:9x/9=-9/9. And that means that x=-1.

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Mrs. Blake's bill at a restaurant was $42.75. She wants to leave the waiter an 18% tip. How much will she pay in all, including
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