You’ve observed the following returns on crash-n-burn computer’s stock over the past five years: 14 percent, –9 percent, 16 percent, 21 percent, and 3 percent. for this stock, calculate the:
a. arithmetic average return (as a percentage, to 2 decimal places)
b. historical variance (to 5 decimal places)
c. standard deviation. (as a percentage, to 2 decimal places)

Part a : solve - vp + 40 < 65 for v . part b : solve 7w - 3r = 15 for r show your work!

Stefano accidentally dropped his sunglasses off the edge of a canyon as he was looking down. the height, h(t), in meters (as it relates to sea level), of the sunglasses after t seconds, is shown in the table. during its descent, the pair of sunglasses passed by a climber in the canyon 6 seconds after stefano dropped them. to the nearest meter, what is difference in elevation between stefano and the climber? 166 meters 176 meters 230 meters 240 meters its b.176 i took the test 166 is wrong and 176 is correct

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.