POW+-+Oct+1-Oct+5

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== **Mrs. Kay is planning a field trip. She wanted to plan how to contact her students by phone in case the field trip they were going on the next day needed to be canceled. She decided to call one student who would then call 2 o** == == **ther students. Each of these students would then call 2 other students. This would continue until all students had been called. Mrs. Kay has 31 students. How many students will need to make phone calls if Mrs. Kay calls the first student? Find a rule for determining how many phone calls will made for any number of students.** ==