So the question here is just simply what percentage is 10 out of 50 correct? You would basically just do 10/50 times 100 which will give you 20 percent as your answer.
For problems like this you can move the y's on the bottem up top by fliping the sign of the exponent (in this case 7 to -7) and MULTIPLYING it with EVERYTHING on top, then because of properties of multplication you can add the exponents to combine them into one term (in this case add 3 and -7 to get -4)

If any of this does not make sense let me know and ill try to clarify better
T1/2 = ln 2 / k = ln 2 / 0.125 = <span>5.5</span>
I dont even know
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Answer is C because there is a constant rate of change (+2) in the y-values. As x increases by 1, y increases by 2.