Evaluate the expression, if x=12, y=8, and z=3 2xy-z3/z

Write the pair of fractions as a pair of fractions with a common denominator

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”?

Which of the following circles have their centers in the third quadrant? check all that apply.