If the length of the 45° region of

this circle is 10 inches, what is the

radius of the circle?

Solve the system of equations. y= 2x y= x^2 - 15

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

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”?