Amanda bought 8 shirts for $132. If long sleeve shirts cost $18 and short sleeve shirts cost $12 , how many of each shirt did she buy? The system of equations to solve this would be: x + y = 8
or
18x + 12y = 132

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

What number line represents the solution set for the inequality -1/2 greater than or equal to 4