Answer:
Step-by-step explanation:no you should not
-9x+27=-13
-9x-27=13
-9x=18
-2=x
Answer:
0.0274
Step-by-step explanation:
The mean is
and the standard deviation is 
Calculate
for 
If
then 
and

Use table for normal distribution probabilities to get that

The answer would be, 325mg is 32.5 cg
5 1/2 = 11/2
11/2 x 3/4 = 33/8 = 4 1/8
answer is B. 4 1/8
Here you go, let me know if you have a question about the steps