Please solve all these polynomial questions it’s due today!

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 is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x