The lengths of manufactured three-inch nails are normally distributes with a mean of 3.00 inches and a standard deviation of .009 inches. The nails are unusable if their lengths are greater than 3.02 inches or less than 2.98 inches. Find the percentage of nails that are unusable.

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?