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babunello [35]
3 years ago
9

No need for explanation

Mathematics
2 answers:
ra1l [238]3 years ago
7 0

Answer:

x=7

Step-by-step explanation:

AysviL [449]3 years ago
5 0

Answer:

x = 7

Step-by-step explanation:

x + 2x + 69 = 90

3x + 69 = 90

3x = 21

x = 7

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9 × a number is 4500. what is the number?
oee [108]
We can write the equation 9x=4500

Now we just solve for x by dividing both sides by 9 to get:
x=500 

Hope this helps!
3 0
3 years ago
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Find the prime factorization of 72.​
barxatty [35]

Answer:

2^3×3^2

and yh

Step-by-step explanation:

2×2×2×3×3

5 0
3 years ago
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A true/false test has 40 questions. Suppose a passing grade is 30 or more correct answers. Test the claim that a student knows m
Angelina_Jolie [31]

Answer:

z≈3.16

p≈0.001

we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level.

Step-by-step explanation:

As a result of step 2, we can assume normal distribution for the null hypothesis

<em>step 3:</em>

z statistic is computed as follows:

z=\frac{X-M}{\frac{\sqrt{p*(1-p)} }{\sqrt{N} } } where

  • X is the proportion of correct answers in the test (\frac{30}{40})
  • M is the expected proportion of correct answers according to the null hypothesis (0.5)
  • p is the probability of correct answer (0.5)
  • N is the total number of questions in the test (40)

z=\frac{0.75-0.50}{\frac{\sqrt{0.5*(0.5)} }{\sqrt{40} } } ≈ 3.16

And corresponding p value for the z-statistic is p≈0.001.

Since p<0.05, we reject the null hypothesis and conclude that the student knows more than half of the answers and is not just guessing in 0.05 significance level.

7 0
3 years ago
I need help plz!! thx
masya89 [10]

Answer:

2nd statement describes the relation between graph of f(x) and graph of g(x).

Step-by-step explanation:  

We are told that graph of g(x)=f(x)-1 and we are asked to choose the correct statement that describes the relation between graph of f(x) and graph of g(x).

The rules for the translation are as follows:  

f(x-h)=\text{Graph shifted to right by h units}

f(x+h)=\text{ Graph shifted to left by h units}

f(x)+h=\text{ Graph shifted upward by h units}

f(x)-h=\text{ Graph shifted down by h units}    

Upon comparing our given translation with above rules we can see that our parent graph f(x) is shifted down by 1 unit to get our new graph g(x).

Therefore, graph of g(x) is the graph of f(x) translated 1 unit down and 2nd option is the right choice.    

7 0
3 years ago
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Im going to buy huaraches in womens (7.5) so do i order that size or order an 8?
lord [1]
Depends on your foot size. I’d go with the 8 as when you hike etc your feet can “swell” some.
3 0
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