A mathematical expression for the quotient of the opposite of 36 and 6, plus the opposite of 9

Easy points boii. read it. ya. fresh

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

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?