(3x - 40)°
(2x - 10)°

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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 graph of a hyperbola represents the equation 16x^2-y^2=16