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vivado [14]
2 years ago
9

Nathan enlists the help of a collector's

Mathematics
1 answer:
klemol [59]2 years ago
8 0
Take a pic of this in Brainly and you’ll see the answers
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Simplify [-2.8]   please help me how to simplify this math proplem??????<br /><br />
Karolina [17]
In fraction form the answer would be -2 4/5.
7 0
3 years ago
Read 2 more answers
Solve equation, check for extraneous solutions
fiasKO [112]

Start with

1=\dfrac{1}{n^2}+\dfrac{n^2-4n-5}{3n^2}

We observe that both fractions are not defined if n=0. So, we will assume n \neq 0.

We multiply both numerator and denominator of the first fraction by 3 and we sum the two fractions:

1=\dfrac{3}{3n^2}+\dfrac{n^2-4n-5}{3n^2} = \dfrac{n^2-4n-2}{3n^2}

We multiply both sides by 3n^2:

n^2-4n-2=3n^2

We move everything to one side and solve the quadratic equation:

2n^2+4n+2=0 \iff 2(n^2+2n+1)=0 \iff 2(n+1)^2=0 \iff n+1=0 \iff n=-1

We check the solution:

1=\dfrac{1}{1}+\dfrac{1+4-5}{3} \iff 1 = 1+0

which is true

8 0
3 years ago
PLEASE HELP, IM TIMED!!!!!!
Andru [333]

Answer:A,B,E

Step-by-step explanation:

7 0
3 years ago
Can someone please answer this question please answer it correctly and please show work please help me I need it
Olin [163]

Answer:

9-3=6

Step-by-step explanation:

Line from left to right: number 9 (absolute value)

Line from right to left: number 3 (absolute value)

Overall: 9-3=6

We used the minus sign for 3 because the corresponding line is oriented in the opposite direction.

4 0
3 years ago
Read 2 more answers
The article "Occurrence and Distribution of Ammonium in Iowa Groundwater" (K. Schilling, Water Environment Research, 2002:177–18
Papessa [141]

Answer: 95% confidence interval for the difference between the proportions would be (1.31, 1.39).

Step-by-step explanation:

Since we have given that

Number of alluvial wells = 349

Number of quaternary wells = 143

Number of alluvial wells that had concentrations above 0.1 = 182

Number of quaternary wells that had concentrations above 0.1 = 112

Average of alluvial wells = 0.27

Standard deviation = 0.4

Average of quaternary wells = 1.62

Standard deviation =1.70

So, 95% confidence interval gives

alpha = 5% level of significance.

\dfrac{\alpha}{2}=2.5\%\\\\z_{\frac{\alpha}{2}}=1.96

So, 95% confidence interval becomes,

(1.62-0.27)\pm 1.96\sqrt{\dfrac{0.4^2}{349}+\dfrac{1.7^2}{143}}\\\\=1.35\pm 1.96\times 0.020\\\\=(1.35-0.040,1.35+0.040)\\\\=(1.31,1.39)

Hence, 95% confidence interval for the difference between the proportions would be (1.31, 1.39).

6 0
3 years ago
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