Which of the following equations below represents how to find the area of the smaller rectangle? Answer
A
9cm x 15cm = 135cm2
B
(9cm + 4cm) x (15cm + 5cm) = 260cm2
C
(9cm - 4cm) x (15cm - 5cm) = 50cm2
D
None of the above

Studies show that massage therapy has a variety of health benefits and it is not too expensive. a sample of 12 typical one-hour massage therapy sessions showed an average charge of $58. the population standard deviation for a one-hour session is =$5.55. a. what assumptions about the population should we be willing to make if a margin of error is desired? (select your the population has uniform distribution/ the population is at least approximately normal is required/ the population has no exponential distribution/ no assumptions should be made) b. using 90% confidence, what is the margin of error (to 2 decimals) c. using 99% confidence, what is the margin of error (to 2 decimals)