What are some three -digit numbers that show 8? 80? 800?

Simply 8x squared + 5(7x squared- x) - 2x =

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

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”?