4) Expand and simplify the following as far as possible: (The a) (a-b)(a+b)
d)
")
b) (x-3)(x+3) e) (24 – 264)(24 +264)
att
c) (20-3b)(2a +36)
1) (1+2x) (1 - 2x)​

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units

What is y times x by? y is __ times x