Simplify: -3(y+2)^2-5+6y

Which of the following are accepted without proof in a logical system? check all that apply.

Use sigma notation to represent the following series for 9 terms.

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”?