A 20-foot wire is tied from the top of a flagpole to a stake in the ground. If the stake is 7 feet from the base of the flagpole, find the height of the flagpole. Round your answer to
the nearest tenth.

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?