Need a quick answer please

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

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”?