Identify all the numbered angles that are congruent to the given angle

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

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”?

What is the circumference of a circle with an area of 50.24 cm²?