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3 years ago

Solve the proportion 7x + 1 9 = 2x 3

Mathematics

1 answer:

gayaneshka [121]3 years ago

4 0

How this makes no sense i’m in middle school

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An item costs $76.49 and the tax is $5.74. What is the percentage of the tax for this item?

Alinara [238K]

Answer:8.11%

Step-by-step explanation:

Before Tax Price: $70.75

Sale Tax: 8.11% or $5.74

After Tax Price: $76.49

3 0

3 years ago

Read 2 more answers

A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normall

Vlad1618 [11]

Answer: (2.54,6.86)

Step-by-step explanation:

Given : A random sample of 10 parking meters in a beach community showed the following incomes for a day.

We assume the incomes are normally distributed.

Mean income : $\mu=\dfrac{\sum^{10}_{i=1}x_i}{n}=\dfrac{47}{10}=4.7$

Standard deviation : $\sigma=\sqrt{\dfrac{\sum^{10}_{i=1}{(x_i-\mu)^2}}{n}}$

$=\sqrt{\dfrac{(1.1)^2+(0.2)^2+(1.9)^2+(1.6)^2+(2.1)^2+(0.5)^2+(2.05)^2+(0.45)^2+(3.3)^2+(1.7)^2}{10}}$

$=\dfrac{30.265}{10}=3.0265$

The confidence interval for the population mean (for sample size <30) is given by :-

$\mu\ \pm t_{n-1, \alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given significance level : $\alpha=1-0.95=0.05$

Critical value : $t_{n-1,\alpha/2}=t_{9,0.025}=2.262$

We assume that the population is normally distributed.

Now, the 95% confidence interval for the true mean will be :-

$4.7\ \pm\ 2.262\times\dfrac{3.0265}{\sqrt{10}} \\\\\approx4.7\pm2.16=(4.7-2.16\ ,\ 4.7+2.16)=(2.54,\ 6.86)$

Hence, 95% confidence interval for the true mean= (2.54,6.86)

7 0

3 years ago

Use the distributive property to remove the parenthese (u-9)6

pychu [463]

<span>(u-9)6
= 6u - 54 ...expanded by using distributive property

hope that helps</span>

5 0

2 years ago

Read 2 more answers

A car travels 65 km in 1 hour. what is its average speed in meters per second?

deff fn [24]

<span>Its speed is 18.05 m/s</span>

7 0

3 years ago

Please help and please make sure it’s right

slamgirl [31]

Answer:

135 degrees

Step-by-step explanation:

all the angles in a triangle need to add to 180 degrees, so you take

180-(65+70)= 45

Then you just find the supplementary angle

45+x=180

x=135

7 0

3 years ago