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3 years ago

What is the value of x? 120 - units 113 units 2/3 units 32 units

Mathematics

1 answer:

rewona [7]3 years ago

7 0

Answer:

candice

Step-by-step explanation: dic fit in yo mouth

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Is ⅓ a terminating or repeating decimal ?

Tju [1.3M]

Answer:Repeating Decimal

Step-by-step explanation:

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3 years ago

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The height, h of a baseball, in meters at t seconds after it is tossed out of a window

Vadim26 [7]

You'll be solving:

-5t^2 + 20t + 15 = 3t + 3

5t^2 - 17t - 12 = 0

(t - 4)(5t + 3) = 0

t = 4 or t = -3/5, but let's assume t ≥ 0

Step-by-step explanation:

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2 years ago

- Maria wants to buy a ring that costs $67.00. She has a coupon for 25% off.

Vilka [71]

Answer:

$16.75

Step-by-step explanation:

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 67 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 67 is 100%, so we can write it down as 67=100%.

4. We know, that x is 25% of the output value, so we can write it down as x=25%.

5. Now we have two simple equations:

1) 67=100%

2) x=25%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

67/x=100%/25%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 25% of 67

67/x=100/25

(67/x)*x=(100/25)*x - we multiply both sides of the equation by x

67=4*x - we divide both sides of the equation by (4) to get x

67/4=x

16.75=x

x=16.75

now we have:

25% of 67=16.75

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3 years ago

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PLEASEEEE ANSWER THIS FOR MEE IM FAILING

Andrej [43]

Answer:

I would say choice A

Step-by-step explanation:

Hope this helps!

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3 years ago

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A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly se

Darina [25.2K]

Answer: (17.42, 20.78)

Step-by-step explanation:

As per given , we have

Sample size : n= 9

$\overline{x}=19.1$ years

Population standard deviation is not given , so it follows t-distribution.

Sample standard deviation : s= 1.5 years

Confidence level : 99% or 0.99

Significance level : $\alpha= 1-0.99=0.01$

Degree of freedom : df= 8 (∵df =n-1)

Critical value : $t_c=t_{(\alpha/2,\ df)}=t_{0.005,\ 8}= 3.355$

The 99% confidence interval for the population mean would be :-

$\overline{x}\pm t_c\dfrac{s}{\sqrt{n}}$

$19.1\pm (3.355)\dfrac{1.5}{\sqrt{ 9}}\\\\=19.1\pm1.6775\\\\=(19.1-1.6775,\ 19.1+1.6775)\\\\=(17.4225,\ 20.7775)\approx(17.42,\ 20.78)$

Hence, the 99% confidence interval for the population mean is (17.42, 20.78) .

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3 years ago