What is the midpoint?

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

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

If f(x)=-3x+2 and g(x)=-7x-2, which point represents f(x)=g(x)?