Bell thinks there are four more tens in 45 than in 15. Is Bella correct? Explain your answer.

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.

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

When y’all answer can y’all explain too !