I'm unsure as to whether or not you have the complete question posted, but I will work with what you gave.
It is possible to say that the population density of a town is 145 people per block. It can depend on how many people live in each house, if there are any vacant houses, how many houses are on each block, and if there are any apartments on the blocks. Without certain details concerning them, one can only assume, but from the details that I have it is certainly possible to have 145 people living on each block.
Answer:
why can't I see the picture on my screen
Answer:
your answer will add up to or = 29
Step-by-step explanation:
Answer:
Last option is the correct answer.
Step-by-step explanation:
Total number of movies = 9+7+4=20
The total number of combinations of choosing 3 movies from total 20 is represented by 20C3. Then there are 9 action movies and we're choosing 3, the number of combinations will be 9C3,
Now, the probability of choosing all action movies will be:

As we know that probability of something which is not happening is given as : 1 - probability of something happening, so the probability of not choosing all action movies is given by: 
Hence, option D or last option is the right one.
Answer:
$0.07
Step-by-step explanation:
nails = 3.10/155 = 0.02/piece
screws = 7.65/85 = 0.09/piece
0.09 - 0.02 = 0.07