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nata0808 [166]
3 years ago
7

If 99 students had a mean quiz score of 82, how much is the mean score increased by the addition of a single score of 99? Explai

n.
Mathematics
1 answer:
Leviafan [203]3 years ago
8 0
The Mean would increase to 82.17 or a total increase of .17

You have 99 students and the avg is 82, therefore we can multiply 99*82 to get our total points

99*82=8118
We add a single score of 99 to our total points 8118+99= 8217

Then we add the student to the total number of students bringing it to 100 and divide our new total by the our new number of students. 
8217/100 = 82.17
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Find the value of 83 - [59 - (22 - 18)]
Kipish [7]
Use order of operations (PEMDAS) 
<span>83-<span>(<span>59-<span>(<span>22-18</span>)</span></span>)
</span></span><span><span>83-<span>(<span>59-4</span>)
</span></span></span><span><span>83-55=</span></span>28

Final answer: 28 
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3 years ago
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3 years ago
Find the equation of the line perpendicular to 3x-7y=42 which passes through the point (-3,-8)
harkovskaia [24]
For perpendicular lines, m1m2 = -1 or m2 = -1/m1; where m1 and m2 are the slopes of the lines.
Here line 1 is 3x - 7y = 42
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Required equation y - y1 = m2(x - x1)
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4 0
3 years ago
The speed, v, of a wave is inversely proportional to the square root of the
yKpoI14uk [10]

Answer:

v = 120

Step-by-step explanation:

If v is inversely proportional to square root of d, then we can write

v \sqrt{d} = k    

If v  = 30 and d = 400, then

30(\sqrt{400}) = k

k = 30(20) = 600

Now v \sqrt{d} = 600

If d = 25, then v\sqrt{25} = 600

                         5v = 600

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5 0
3 years ago
what is the simplified form of the following expression? Assume x is greater than or equal to 0 and y is greater than or equal t
yarga [219]

the given expression is :

2(4√16x) - 2(4√2y) + 34√81x - 4(4√32y)

⇒ 8(√16x) - 8(√2y) + 34√81x - 16√32y  

⇒8×4√x - 8√2y + 34×9√x - 16√16×2y     [∵ √16 = 4 and √81 = 9]

⇒32√x - 8√2y + 306√x - 16×4√2y

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⇒338√x -72√2y

4 0
3 years ago
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