For the secound one u multiply I belive
Answer:
0.7026
Step-by-step explanation:
Let X denote the lifetime of light bulb. Given 
where the mean is 
.
Recall that,
Answer:
All angles are equal because all sided are equal so the 1st 1 is 60 .
the 2nd is 80
If you put in the substitutions it would be 2*2-(2*2*4)+(3*2)-(-4*2)+(2*4).
Simplified further by multiplying it would be 2*2-8+6--8+8
the negative 8 could be simplified further since the negatives cancel out so you'll have 2*2-8+6+8+8.
Then using the order of operations you would multiply the 2's together first to get 4 so you have 4-8+6+8+8.
After that it's simple addition giving you an answer of -26.
I'm not sure if you're looking for the final answer or just the equation with substitutions but there's both.
I believe the answer is C
