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iren [92.7K]
3 years ago
15

Help Me! Please!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
natulia [17]3 years ago
4 0
A)
Let c be the number of right guesses.
the probability of c answers =.25 and probability of the wrong answer is 1-.25=.75
c distribution is in the parameter of (20, .25).
b) mean = 20 * .25== 5
c) p of c guess =.25 ^20 =9.095* 10 ^-13
d) p of 10 c guess =.014 or 1.4% it is not possible for him to have 10 right guess.


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Which expression is equivalent to startfraction m minus 4 over m 4 endfraction divided by (m 2) ?
sertanlavr [38]

Rational functions are written as fractions. The expression equivalent to \frac{\dfrac{m-4}{m+4} }{m+2} is \frac{m-4}{m^2+6m+8}

<h3>Rational functions</h3>

Given the rational function expressed as:

\frac{\dfrac{m-4}{m+4} }{m+2}

This can be further expressed as:

\frac{m-4}{(m+4(m+2)}


Factorize the denominator to have;

\frac{m-4}{m^2+4m+2m+8}\\ \frac{m-4}{m^2+6m+8}

Hence the expression equivalent to \frac{\dfrac{m-4}{m+4} }{m+2} is \frac{m-4}{m^2+6m+8}

Learn more on rational function here: brainly.com/question/1917026

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Amiraneli [1.4K]

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What is 9.27 million in scientific notation
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a)out of 300 students In a class 60% of the students took physics and 35 students took chemistry and 20% of the students did not
Kipish [7]

Answer:

25 students take both subjects.

Step-by-step explanation:

Solve for 60% of 300 students:

60/100 = x/300

Cross multiply:

60 × 300 = 100 × x

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Divide both sides by 100:

180 = x

Solve for 20% of 300 students:

20/100 = x/300

20 × 300 = 100 × x

6000 = 100x

60 = x

Solve for the percentage of students in chemistry:

x/100 = 35/300

x × 300 = 100 × 35

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x = 11.66666...7

x = about 11.7%

Find the difference in percentages:

100 - 60 - 20 - 11.7

8.3

8.3% take both subjects

Solve for 8.3% of students:

8.3/100 = x/300

8.3 × 300 = 100 × x

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About 25 students

Check your work by adding all the students together (to get to 300):

25 + 60 + 180 + 35

300 students total

This is correct!

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