8d - 4d - 6d - 8 = 2d how do i solve ?

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”?

Predict which statements are true about the intervals of the continuous function. check all that apply