D.the number of times the drug has removed a certain percentage of fluid from the patient's lungs
Answer:
Step-by-step explanation:
By geometric mean theorem:

For these problems you have to use PEMDAS so for problem 15 you would do the parentheses first, (21-3) you get 18 and then exponents, 3^2, you get 9, no multiplication but there is division so take your answers, 18 and 9 and divide them, you get 2, so the answer to 15 is 2.
The answer is 19 pls mark brainliest if correct
<span>x(1^2)-2(1)+4(1^3)=6
x - 2 + 4 = 6
x + 2 = 6
x = 4 </span>