Let * be the binary operation z (set of integers) defined by a*b=2ab+5 . 1. Show that * is commutative. Hint: Show that a*b=b*a.

2. Show that * is Associative. Hint: Show that (a*b)*c=a*(b*c).​

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Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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.