1+ 2/5 × 4/5 ÷ 1/2( these are fractions btw)

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

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?