How do you even do this? i honestly dont understand it

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?

1) what is the measure of the exterior angle, ∠uvw ? 2) in triangle man, what is the measure of the exterior angle at n (in degrees)?

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29