The image shows rock layers and magma under earth's surface. 7 layers of rock formation. the top 5 layers are existing rock layers. point 4 is the bottom layer of molten material moving up through top layers. point 3 is two layers above 4 close to where the molten material is moving upward. point 2 is three layers above 3. point 1 is the first layer below the surface of the earth. at which location are metamorphic rocks most likely forming? 1 2 3 4

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Element j is 1s 2s 2p 3s . (i) how many unpaired electrons does j have? (ii) is j a good oxidizing agent or a reducing agent? (iii) state reason for the answer.