Dan painted 3/4 of a wall using 1/4 a can of paint. select all tje statements that are true. a. he can paint 2 walls with 1/2 a can of paintb. he can paint 3 walls with 1 can of paintc. he can paint 5 walls with 1 2/3 can of paint d. he can paint 8 walls with 2 cans of paint e. you can paint 10walls with 2 1/2 cans of paint f. he can paint 11 walls with 3 2/3 cans of paint

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Math it's appreciated. (picture provided)

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?