What two numbers can get rounded to 2.5

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

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”?

What is the gcf of 20c^3-5c^4+30c^6