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dusya [7]
3 years ago
7

Need help pls , 20 points no links or else I will report

Mathematics
2 answers:
Nesterboy [21]3 years ago
8 0

Answer:

  • 18² + (3/4x)² = x²
  • 18² = x² - 9/16x²
  • 18² = 7/16x²
  • x² = 16*18²/7
  • x = 72/√7
  • x ≈ 54.42
uysha [10]3 years ago
7 0

Answer:

x=72

Step-by-step explanation:

x=3/4x+18

4(x=3/4+18)

4x=3x+72

x=72

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Answer:

I think it is D but im not sure if you said 10 days or something else

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3 years ago
Please Simplify 2(7a+8)=86
Anna11 [10]

Answer

5

Step-by-step explanation:

First you do whats in the parentheses

So it will look like this

14a+16=86 now you want to get 14a by itself so -16 from 86

then you get 14a=70

now divide 14a from 70 and your answer is 5

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3 0
4 years ago
Identify the property illustrated by 3x + 4 = 4 + 3x
Ne4ueva [31]
Explanation:

Answer:
All real numbers are solutions
7 0
3 years ago
Read 2 more answers
City health officials will conduct a two-sample t-test for a difference in means to investigate whether
Anvisha [2.4K]

Answer:

The calculated value     t =   2.366 > 2.0301 at 0.05 level of significance

The null hypothesis is rejected

There is a difference between the means      

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given that the first sample size 'n₁' = 22

Given that the mean of the first sample x₁⁻ = 120

Given that the standard deviation of the sample (s₁) = 20

Given that the mean of the second sample x₂⁻ = 100

Given that the standard deviation of the second sample (S₂) = 30

<u><em>Step(ii):-</em></u>

T-test statistic

               t = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{S^{2} (\frac{1}{n_{1} }+\frac{1}{n_{2} } ) } }

     where

             S^{2} = \frac{n_{1} S_{1} ^{2}+n_{2} S_{2} ^{2}   }{n_{1} +n_{2}-2 }

            S^{2} = \frac{22( 20)^{2}+ 15(30) ^{2}   }{22 +15-2 }

           S² =  637.1428

           S = √637.1428 = 25.24168  

The standard deviation of the sample 'S' = 25.24168   

<u><em>Step(iii):-</em></u>

<u><em>Null Hypothesis:H₀:</em></u>

There is no difference between the means

<u><em>Alternative Hypothesis:H₁:</em></u>

There is a difference between the means

         T-test statistic

               t = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{S^{2} (\frac{1}{n_{1} }+\frac{1}{n_{2} } ) } }

              t = \frac{ 120 -100 }{\sqrt{637.14 (\frac{1}{22 }+\frac{1}{15 } ) } }

             t =   2.366

Degrees of freedom

           γ = n₁+n₂ -2 = 22+15-2 = 35

     t₀.₀₅ = 2.0301

The calculated value     t =   2.366 > 2.0301 at 0.05 level of significance

The null hypothesis is rejected

There is a difference between the means          

3 0
3 years ago
Read 2 more answers
15 cm
siniylev [52]

Answer:

90????? There is not a lot of context. 90 is the area

8 0
3 years ago
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