If they work together, Mark and Yvonne can sort 50 library books in 1.5 hours. Working alone, it would take Yvonne 5 hours to do the same job. How long would it take Mark if he worked alone? Express your answer in
hours and minutes.
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Of four points are collinear, they are also coplanar

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”?

Factor this polynomial completely. x^2-8x+12