Correct question:
Manny walked a total of 3 miles. The reference point used to calculate the total distance that he walked was the same as the ending point. Which describes where Manny most likely walked?
a. from the bottom of a hill to the top
b. on a circular nature trail
c. on a sidewalk from his house to the mall
d. from the beginning of a straight track to the end
Answer:
b. on a circular nature trail
Explanation:
As it is mentioned that Manny that his reference point from where she started is same as ending point meaning that she moved in a circular path making point B correct answer.
D. lost an electron
because they have free electron in the outermost shell which they will like to denote, in order to attain stable configuration
Try Socratic it helped me with this type of question
a) Density at 100 degrees: 
Explanation:
The density of mercury at 0 degrees is 
Let's take 1 kg of mercury. Its volume at 0 degrees is
The formula to calculate the volumetric expansion of the mercury is:
where
is the cubic expansivity of mercury
V is the initial volume
is the increase in temperature
In this part of the problem, 
So, the expansion is
So, the new density is
b) Density at 22 degrees: 
We can apply the same formula we used before, the only difference here is that the increase in temperature is
And the volumetric expansion is
So, the new density is
decomposition
A decomposition reaction is just the opposite of combination reaction
