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3 years ago

WE NEED ANSWERS HELP US!!!!

Mathematics

2 answers:

IgorLugansk [536]3 years ago

5 0

It's the second one. She did not find the reciprocal before multiplying

larisa [96]3 years ago

4 0

The answer is the second one. She did not find the reciprocal first

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Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the pre

artcher [175]

Answer: The proportion of new car buyers that trade in their old car has statistically significantly decreased.

Step-by-step explanation:

Since we have given that

p = 48% = 0.48

n = 115

x = 46

So, $\hat{p}=\dfrac{46}{115}=0.40$

So, hypothesis would be

$H_0:\ p=\hat{p}\\\\H_a:p$

So, test value would be

$z=\dfrac{p-\hat{p}}{\sqrt{\dfrac{p(1-p)}{n}}}\\\z=\dfrac{0.48-0.40}{\sqrt{\dfrac{0.48\times 0.52}{115}}}\\\\z=\dfrac{0.08}{0.0466}\\\\z=1.72$

At 10% level of significance, critical value would be

z= 1.28

Since 1.28 < 1.72

So, we will reject the null hypothesis.

Hence, the proportion of new car buyers that trade in their old car has statistically significantly decreased.

6 0

3 years ago

The Bar Chart shows the weights of 10 dogs entered in a local dog show,

hammer [34]

Is there any picture ?

7 0

3 years ago

Simplify the expression. (5x2 - x - 7) + (2x2 + 3x + 4)

kifflom [539]

Answer:11+2x

Step-by-step explanation:

(10-7-x)+(4+4+3x)

3-x+8+3x

3+8+3x-x

11+2x

3 0

3 years ago

What is the value of x? <br><br><br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B4%7D%7B5%7D%20x%20-%20%20%5Cfrac%7B1%7D%7B10%

NeTakaya

Answer:

x = $\frac{1}{2}$

Step-by-step explanation:

Given

$\frac{4}{5}$ x - $\frac{1}{10}$ = $\frac{3}{10}$

Multiply through by 10 ( the LCM of 5 and 10 ) to clear the fractions

8x - 1 = 3 ( add 1 to both sides )

8x = 4 ( divide both sides by 8 )

x = $\frac{4}{8}$ = $\frac{1}{2}$

6 0

3 years ago

If BCD ~ GEF, find BD

Tju [1.3M]

Answer:

BD= 19

Step-by-step explanation:

4 0

3 years ago