In 2018, there were about 32 million teenagers (aged 13–17) in the United States. They each sent an average of 1200 text messages per month. About how many text messages did all of the teenagers in the United States send each month? Express your answer using SCIENTIFIC NOTATION.

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?

What is the equation, in point-slope form, of the line that has a slope of 6 and passes through the point (–1, –8)? a. y+8 = 6 (x+1 )

Solve the system of equations. 2x-2y=-4 and x+y=8. show work