Anewborn boa constrictor measures 18 inches long. an adult boa constictor measures 9 times the length of the newborn plus 2 inches. how long is the adult?

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”?