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TiliK225 [7]
3 years ago
6

Ethan correctly answers 80% of the total questions on his history test. Enter the number of questions on Ethan’s history test.

Mathematics
2 answers:
jasenka [17]3 years ago
8 0
It might be about 20 questions
Citrus2011 [14]3 years ago
5 0
Since you didn't give me a total # of questions on the test, I can't give you a direct answer.... 


But I can walk you through.

In math, "of", means you have to multiply. 

80%= .8  This is bc 100% is = 1.00. 
() mean times or multiplied by
====================================================================
So you would do .8(how ever many total questions were on the test)
Whatever # you get is the answer. 


Hope I could help!!!
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Which of the following point-slope form equations could be produced with the points (-1, 4) and (2, -3)?
Nikolay [14]

Answer:

Option B, y + 3 = -7/3(x - 2)

Step-by-step explanation:

<u>Point slope form:  (y - y1) = m(x - x1)</u>

<u />

<u>Step 1:  Find the slope</u>

m = \frac{y2 - y1}{x2 - x1}

m = \frac{-3 - 4}{2 - (-1)}

m = \frac{-7}{2 + 1}

m = \frac{-7}{3}

<u>Step 2:  Plug into the point slope form</u>

(y - 4) = -7/3(x - (-1))

(y - 4) = -7/3(x + 1)

OR

(y - (-3)) = -7/3(x - 2)

y + 3 = -7/3(x - 2)

Answer:  Option B, y + 3 = -7/3(x - 2)

3 0
3 years ago
Evaluate the expression, using the given value of the variable.
natka813 [3]
-10 is the answer to the question above.
3 0
3 years ago
Read 2 more answers
According to a recent​ poll, 25​% of adults in a certain area have high levels of cholesterol. They report that such elevated le
Readme [11.4K]

Answer:

The answer is below

Step-by-step explanation:

The z score is used to determine by how many standard deviations the raw score is above or below the mean. The z score is given by:

z=\frac{x-\mu}{\sigma} \\\\for\ a \ sample(n):\\\\z=\frac{x-\mu}{\sigma/\sqrt{n} }\\\\where\ x=raw\ score,\mu=mean, \sigma=standard deviation

Given that n = 49, μ = 260 mg/dL, σ = 35 mg/dL

a) For x < 210:

z=\frac{x-\mu}{\sigma/\sqrt{n} } =\frac{210-260}{35/\sqrt{49} } =-10

From the normal distribution table, P(x < 210) = P(z < -10) = 0.0001

b) For x > 205:

z=\frac{x-\mu}{\sigma/\sqrt{n} } =\frac{205-260}{35/\sqrt{49} } =-11

For x < 215:

z=\frac{x-\mu}{\sigma/\sqrt{n} } =\frac{215-260}{35/\sqrt{49} } =-9

P(205 < x < 215) = P(-11 < z < -9) = P(z < -9) - P(z < -11) = 0.0001 - 0.00001 = 0.00009

c) For x < 200:

z=\frac{x-\mu}{\sigma/\sqrt{n} } =\frac{200-260}{35/\sqrt{49} } =-12

From the normal distribution table, P(x < 200) = P(z < -12) = 0.00001

d) For x > 222:

z=\frac{x-\mu}{\sigma/\sqrt{n} } =\frac{222-260}{35/\sqrt{49} } =-7.6

From the normal distribution table, P(x > 200) = 1 - P(z < -12) = 1 - 0.0001 = 0.9999

7 0
3 years ago
Parker was giving this problem on his homework: 6x*2 - 4y + 2x + 4x*2 + 8y. Here is the work he show to simplify the expression
Alex_Xolod [135]
In the fourth step, he didn’t put the “negative” sign for 4.
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A cube has a volume of 216cm3. What is the length of one side?
Talja [164]

Answer:

6

Step-by-step explanation:

6 cubed is 216

5 0
3 years ago
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