2. kim is x years old. jordan is 7 years older than kim. four times jordan’s age is equal to 200.
(a) write an equation that could be used to solve for kim’s age, x.
(b) how old is kim?
(c) how old is jordan?

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”?