Isabel walks 0.83 miles to and from the library 3 days a week. about how many miles does she walk in 4 weeks? answers are: a. about 3 miles b. about 4 miles c. about 12 miles d. about 18 miles

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Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

Change negative exponents to positive. then solve. round to four decimal places