
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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we are going over the guess and check method. and im having trouble setting up this problem.
"Rachel works two different jobs. She is paid $15 per hour as a caretaker for a senior citizen and $8 per hour as a dog walker. last week she worked a total of 21 hours and earned a total of $280. How many hours did she work at each job that week?"
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