In rectangle ABCD the opposite sides AB and CD both have a slope of 7. What's the slope of side BC. Show your work.​

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

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”?

Which number line correctly shows 0.8 + 0.3?