Mackenzie earned a score of 79 on her semester biology test. she needs to have a total of at
least 160 points from her semester and final tests to receive a b for her grade. what score must
mackenzie earn on her final test to ensure her b?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

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.

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi