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Rina8888 [55]
3 years ago
8

Someone help me find the area please

Mathematics
1 answer:
kolezko [41]3 years ago
5 0
Do (10 x 10) then (10 x 20), and then add your two answers together.
Its simple :)
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After earning interest, the balance of an account is $420. The new balance is 7/6bof the original balance. Write an equation tha
puteri [66]
Well, we know that the total amount is $420, so we can already set one side of the equation. =420. Also, it said that the $420 is (equal to) 7/6b (b for balance).
Now just put it together!  7/6b=420 is your answer.

7 0
3 years ago
Quarters are currently minted with weights normally distributed and having a standard deviation of 0.065. New equipment is being
Ilya [14]

Answer:

Yes, the new equipment appear to be effective in reducing the variation of​ weights.

Step-by-step explanation:

We are given that Quarters are currently minted with weights normally distributed and having a standard deviation of 0.065.

A simple random sample of 25 quarters is obtained from those manufactured with the new​ equipment, and this sample has a standard deviation of 0.047.

Let \sigma = <u><em>standard deviation of weights of new equipment.</em></u>

SO, Null Hypothesis, H_0 : \sigma \geq 0.065      {means that the new equipment have weights with a standard deviation more than or equal to 0.065}

Alternate Hypothesis, H_A : \sigma < 0.065      {means that the new equipment have weights with a standard deviation less than 0.065}

The test statistics that would be used here <u>One-sample chi-square</u> test statistics;

                           T.S. =  \frac{(n-1)s^{2} }{\sigma^{2} }  ~ \chi^{2}__n_-_1

where, s = sample standard deviation = 0.047

           n = sample of quarters = 25

So, <u><em>the test statistics</em></u>  =  \frac{(25-1)\times 0.047^{2} }{0.065^{2} }  ~  \chi^{2}__2_4   

                                     =  12.55

The value of chi-square test statistics is 12.55.

Now, at 0.05 significance level the chi-square table gives critical value of 13.85 at 24 degree of freedom for left-tailed test.

Since our test statistic is less than the critical value of chi-square as 12.55 < 13.85, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u><em>we reject our null hypothesis</em></u>.

Therefore, we conclude that the new equipment have weights with a standard deviation less than 0.065.

5 0
3 years ago
Need help fast i'll give the brainiest to who ever is right! tell me where to but the dots
Dmitriy789 [7]
Y-2= -3/4(x-6)
y=-3/4(x-6)+2
y=-3/4x+9/2+2
y=-3/4x+13/2

so for example if x=1 then y=5.76
or if x= 5 then y=2.75
7 0
3 years ago
James is estimating the amount of paint he needs for the walls of his 3.4m by 2.6m bedroom. His bedroom is 2.7m high. One litre
bixtya [17]
James will need about 5.008 Liters of Paint.

8 0
3 years ago
A pole 10 feet tall is used to support a guy wire for a tower, which runs from the tower to a metal stake in the ground. After p
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The pole length to the nearest wire should be 10x15
6 0
3 years ago
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