D, because a histogram does not show individual data points
we know that
the algebraic expression is equal to

therefore
<u>the answer is</u>

Let
be the weight of i-th player.
1. If the mean weight of 4 backfield members on the football team is 221 lb, then

2. If the mean weight of the 7 other players is 202 lb, then

3. From the previous statements you have that

Add these two equalities and then divide by 11:

Answer: the mean weight of the 11-person team is 
Answer:

Step-by-step explanation:
Given the equation:

To find:
The solutions of given equation in the range [0, 2
) i.e. 0 can be in the answer but
can not be there in the answer.
Solution:
Taking
common, we get:

The solutions can be given as:
OR 
Let us solve both the equations one by one:
First equation:

Second equation:

Therefore, the answers as a comma separated list are:

Answer:
c
Step-by-step explanation:
3 is a prime number, it cannot be factored into other prime factors