Suppose in 1970 there were 1.3 million college degrees awarded. This number increased to 2.5 million in 2010. (a) Find a linear function D that approximates degree
numbers in millions x years after 1970.
(b) Interpret the y-intercept on the graph of D.
(c) Estimate symbolically when this number was 2.2 million.
(a) D(x) =
(Use integers or decimals for any numbers in the expression.)

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?