HELP ASAP! Can someone please help me with this problem. I tried inputting the numbers into the standard deviation equation but I did not get the right answer. Can someone please help me? Thank you for your time.

Which graph represents 2x-5y< 15

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days