Each month, allison gets a $15 allowance and earns $100 working at the theater. she uses the expression 15x + 100y to keep track of her earnings. part a: identify the variables and coefficients in the expression. part b: how many terms are in the expression, what are they, and how do you know? part c: which term in the expression shows the total earned from her allowance?

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?