3x-5y= -7
9x+7y= 89
solve the system of equations and enter answer an an ordered pair.

Evaluate the following expression 1/3^2

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?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)