How do you multiply fractions using diagrams?

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?

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 two numbers if their sum is 91 and the ratio is 6: 7?