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Semmy [17]
3 years ago
5

Solve each system by ELIMINATION 1) -5x-Y=21 - 4x Y=6

Mathematics
1 answer:
sesenic [268]3 years ago
5 0
-5x-Y + -4x + Y = -9x
21 +6= 27
-9x = 27
x= -3
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Find the slope of the line that passes through (10, 5) and (7, 4).
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Step-by-step explanation:

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3 years ago
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Gribbles are small, pale white, marine worms that bore through wood. While sometimes considered a pest since they can wreck wood
Stells [14]

<u>Answer with explanation:</u>

As per given , we have

A sample of 50 gribbles finds an average length of 3.1 mm with a standard deviation of 0.72.

i.e. n= 50

Degree of freedom = n-1=49

\overline{x}=3.1\ mm

s=0.72\ mm

The point estimate of the population mean is equals to the sample mean.

i.e. The best estimate for the length of gribbles= 3.1 mm

Also, population standard deviation is unknown , then the confidence interval would be :

E=t_{\alpha/2, df}\dfrac{s}{\sqrt{n}}

For df= 49 and significance level of 0.05 , the t- value (using t-distribution table) would be :

t_{0.05/2, 49}=t_{0.025, 49}= 2.010

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=0.204664986747\approx0.20

95% confidence interval : (\overline{x}-E,\ \overline{x}+E)

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3 0
4 years ago
Harrison ,Tad and dale ride their bikes to school Harrison rides 3/4 mile,Tad rides 3/8 and dale rides 3/6 mile. Compare and ord
masya89 [10]

Answer:

3/8 , 3/6. 3/4

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Dale rode the second greatest mile because the miles ridden is greater than 3/8 but less than 3/4

Harrison rode the greatest mile because the miles ridden is greater than both 3/6 and 3/8

Step-by-step explanation:

to order the miles ridden , convert the fraction to decimals. to do this, divide the numerator by the denominator

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3/8 = 0.374

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3 years ago
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Tamiku [17]

\frac{11}{?10}
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3 years ago
Write an equation to represent the following statement. 33 is 15 less than k. ______ Solve for k. K= _____
Evgesh-ka [11]

Answer:

in the first box put k-15=33

in the second box put k=48

Step-by-step explanation:

if you look at what it says, it says 33 is 15 less than k. so we know that we are going to have 33 on one side and k and 15 on the other. it also says 15 less than k, so that would be k-15

33=k-15 or k-15=33

now we have to solve this. add 15 to each side to cancel out the -15

that gives you k=48

8 0
3 years ago
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