Solve for the system of liner equations by substitution.
x+4y= -1
-3x-14=y

Match each polynomial with its factorization.

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

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”?