The times to complete the NYC marathon are normally distributed with a mean of 278 minutes and a standard deviation of 62 minutes. If 125 runners are randomly selected then how many do we expect will take less than 3 hours to complete the race. Give your answer to two decimal places and do not give units.

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 .is he correct? explain why or why not

This is about circle theorems. someone asap : (