Z=11 is the answer for this problem
Answer:
Substitution property of equality
Step-by-step explanation:
Given
and 
Then

Required
State the property
From the list of options, (d) answers the question.
This is so because:
Substitution property of equality states that
If
then 
In other words, both can replace one another.
So if
, then 2y + 1 can be substituted for x in
So:
becomes

<em>Hence, it is substitution property of equality</em>
A diagram would be the best option.
Sorry if u rlly need the answer ask me
Answer: The are 39,070,080 different ways the DJ can play the first 6 songs.
We will use the Fundamental Counting Principle to find the answer. Simply determine the number of choices for each position and multiply.
For the first choice there are 21 choices. Then, the number is reduced by 1 each time.
So to get the answer, we have to multiply the numbers below:
21 x 20 x 19 x 18 x 17 x 16