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morpeh [17]
2 years ago
6

Evaluate the expression when g=8 and h=7. 4g-h

Mathematics
2 answers:
givi [52]2 years ago
4 0

Answer: 25

Step-by-step explanation: you replace the letters with the numbers, so it would be:

4(8) - (7)

32-7

=25

Lelechka [254]2 years ago
3 0
25 because 4(8)-7 = 32-7 = 25
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Answer:

- 18

Step-by-step explanation:

note that | 9 | = 9 , thus

- 2 | 9 | = - 2 × 9 = - 18

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2 years ago
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A recent survey showed that in a sample of 100 elementary school teachers, 15 were single. In a sample of 180 high school teache
trapecia [35]

Answer:

By using hypothesis test at α = 0.01, we cannot conclude that the proportion of high school teachers who were single greater than the proportion of elementary teachers who were single

Step-by-step explanation:

let p1  be the proportion of elementary teachers who were single

let p2 be the proportion of high school teachers who were single

Then, the null and alternative hypotheses are:

H_{0}: p2=p1

H_{a}: p2>p1

We need to calculate the test statistic of the sample proportion for elementary teachers who were single.

It can be calculated as follows:

\frac{p(s)-p}{\sqrt{\frac{p*(1-p)}{N} } } where

  • p(s) is the sample proportion of high school teachers who were single (\frac{36}{180} =0.2)
  • p is the proportion of elementary teachers who were single (\frac{15}{100} =0.15)
  • N is the sample size (180)

Using the numbers, we get

\frac{0.2-0.15}{\sqrt{\frac{0.15*0.85}{180} } } ≈ 1.88

Using z-table, corresponding  P-Value is ≈0.03

Since 0.03>0.01 we fail to reject the null hypothesis. (The result is not significant at α = 0.01)

8 0
3 years ago
Complete the function digits(n) that returns how many digits the number has. For example: 25 has 2 digits and 144 has 3 digits
ss7ja [257]

Answer:

Step-by-step explanation:

We can get this done by using the code

def digits(n):

count = 0

if n == 0:

return 1

while (n > 0):

count += 1

n= n//10

return count

Also, another way of putting it is by saying

def digits(n):

return len(str(n))

------------------------------------------

print(digits(25)) # Should print 2

print(digits(144)) # Should print 3

print(digits(1000)) # Should print 4

print(digits(0)) # Should print 1

Doing this way, we've told the system to count the number of figures that exist in the number. If it's 1000 to 9999, then it records it as 4 digits. If it's 100 - 999, then it records it as 3 digits. If it's 10 - 99, it records as 2 digits. If it's 0 - 9, then it has to record it as a single digit.

Thanks

3 0
2 years ago
The solutions to the equation 2x2+x-1=2 are X= -3/2 or x=
Brilliant_brown [7]

Answer:

positive 3/2

Step-by-step explanation:

3 0
2 years ago
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