HELP ME PLEASE

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

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”?

Find the root(s) of f (x) = (x- 6)2(x + 2)2.