There’s a question and the answer is the answer correct don’t worry about minor or major why is it incorrect

Which of the following is true for the relation f(x)=2x^2+1

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?