Put common terms in evidence and simplify:
Answer: 3
Step-by-step explanation:
Let E be the event of that student pierces ear and N be the event of that student pierces nose.
Given: ![n(E\cup N=50)](https://tex.z-dn.net/?f=n%28E%5Ccup%20N%3D50%29)
![n(E)=46\\\\n(N)=7](https://tex.z-dn.net/?f=n%28E%29%3D46%5C%5C%5C%5Cn%28N%29%3D7)
For any two event A and B, we have
![n(A\cup B)=n(A)+n(B)-n(A\cap B)](https://tex.z-dn.net/?f=n%28A%5Ccup%20B%29%3Dn%28A%29%2Bn%28B%29-n%28A%5Ccap%20B%29)
Similarly , ![n(E\cup N)=n(E)+n(N)-n(E\cap N)](https://tex.z-dn.net/?f=n%28E%5Ccup%20N%29%3Dn%28E%29%2Bn%28N%29-n%28E%5Ccap%20N%29)
![50=46+7-n(E\cap N)\\\\\Rightarrow\ n(E\cap N)=53-50=3](https://tex.z-dn.net/?f=50%3D46%2B7-n%28E%5Ccap%20N%29%5C%5C%5C%5C%5CRightarrow%5C%20n%28E%5Ccap%20N%29%3D53-50%3D3)
Hence, 3 students have piercings both on their ears and their noses.
The missing expression should be for Step 3 is [(25 + 3)/0.5] - 16.4 ÷ 4 and the missing expression should be for Step 6 is 56 - 4.1
<h3>Part A: Explain what the missing expression should be for Step 3</h3>
To do this, we make use of the expression in step 2
The expression in step 2 is
[(5^2 + 3)/0.5] - 16.4 ÷ 4
The next step at this stage is to evaluate the expression 5^2
So, we have:
[(25 + 3)/0.5] - 16.4 ÷ 4
Hence, the missing expression should be for Step 3 is [(25 + 3)/0.5] - 16.4 ÷ 4
<h3>Part B: Explain what the missing expression should be for Step 6.</h3>
To do this, we make use of the expression in step 5
The expression in step 5 is
56 - 16.4 ÷ 4
The next step at this stage is to evaluate the expression 16.4 ÷ 4
So, we have:
56 - 4.1
Hence, the missing expression should be for Step 6 is 56 - 4.1
Read more about expressions at:
brainly.com/question/723406
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The slope of the line is -7/6