-2n(5 + n - 8 - 3n)
-10n - 2n² + 16n + 6n²
4n² + 6n
28.7083333333...
But you could also round it up to 29.
The first answer is 5,but i don't know about the second one. (sorry)
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

Answer:
12.25
i think thats right
cause you would divided the 7 by four to get you 1.75 then multiply it by 7
Step-by-step explanation: