Tara's car accelerated from 10 miles per hour to 70 miles per hour in 12 seconds.

what is the approximate rate of change in the miles per hour that tara's car accelerated?
a) 5 miles per hour per second
b) 8 miles per hour per second
c) 18 miles per hour per second
d) 48 miles per hour per second

Zahra was given two data sets, one without an outlier and one with an outlier. data without an outlier: 15, 19, 22, 26, 29 data with an outlier: 15, 19, 22, 26, 29, 81

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items