During a series of 100-meter races, the times of the runners are normally distributed with a mean of 12.5 seconds and a standard deviation of 0.3 seconds. Find the percent of runners that have a time between 11.6 seconds and 12.8 seconds. Explain how you got your answer. part 2. Find the probability that a randomly selected runner has a time greater than 12.8 seconds and less than 13.4 seconds

Which of the following is the formula for the sequence graphed below

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

Write the point-slope form of an equation of the line through the points (-2, -3) and (-7, 4).