Simplify the expression.
1. (2z³)³
simplify the expression.
2. (-8ab)²
simplify the expression.
3. 6 (x³)²

Ineed to know the answer right now! !

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”?

How many ordered pairs of positive integers satisfy xy=32?