Decide whether or not each equation represents a proportional relationship. Answer each question with yes or no. 1. Volume measured in cups (c) vs. the same volume measured in ounces (z): c=18z

2. Area of a square (A) vs. the side length of the square (s): A = s2

3. Perimeter of an equilateral triangle (P) vs. the side length of the triangle (s): 3s=P

4. Length (L) vs. width (w) for a rectangle whose area is 60 square units: L=60w

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?