A relation where every input has one and only one output is called what?

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

Which math sentence can be used to determine if the triangle is a right triangle?

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?