Solve for x round to your nearest tenth

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

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 value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?