Is 30/50 equivalent to 3/5

Is the point (0, 8) on the x-axis or y-axis? how do you know?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

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”?