Explain the steps needed to determine the value of the expression shown below. be
sure to provide the correct value of the expression in your explanation
1/2
— + (- 1/4)
- 2/5
answer

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

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.

Julie multiplies 6.27 by 7 and claims the product is 438.9 .explain without multiplying how you know juliesanswer is not correct.find the correct answer