Jorryn says that 10 less than 3 times his age is equal to 11 years old. How old is Jorryn? 57 years old
63 years old
7 years old
3 years old

A(t)=728(1+0.04)^t how much money did aditya originally invest

Can someone me out here number 4 plz

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”?