What is the base in the expression 4⁵?
1.4
2.5
3.9
4.20

Which statement about perfect cubes is true

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 and of which kind of roots does the equation f(x)=x3−x2−x+1