Which number lies halfway between:
a) 16 and 38
b) 259 and 361
1004 and 2 012?
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Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

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.