Math answers .if you take a test with 1 0questions and got 7 of them right, what decimal part would that be? what decimal part did you get wrong? ? explain

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 effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.