Is -2 greater than -6

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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”?

Find the greatest common factor of the followig monomials 46g^2h and 34g^6h^6