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GaryK [48]
3 years ago
6

Estimate the product of 38*249

Mathematics
2 answers:
AnnZ [28]3 years ago
5 0
The correct answer is 10,000
NemiM [27]3 years ago
3 0
I think its 9500, depends on how you are rounding it by the hundreds or the thousands
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Calculate the value of 18(-3)
Anon25 [30]

Answer:

-54

Step-by-step explanation:

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3 years ago
Please help me with the correct answer <br><br> Solve (x - 3)^2=5
Rus_ich [418]
The answer is B. First solve the parentheses. Then make a quadratic equation and solve from there.
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2 years ago
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Help please with #3
Alenkasestr [34]

Answer: x = 2a over b + c

Step-by-step explanation:

1. Multiply both sides by two. This cancels out 2 and turns a into 2a. It should look like 2a = bx + cx

2) Since both b and c have x’s, we turn it into (b + c)x

3. Then divide both sides by b+c to get 2a over b + c = x

6 0
3 years ago
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
Can Someone help me answer these?
Fittoniya [83]

for number 15

K= 12

for 17

answer is -36

4 0
3 years ago
Read 2 more answers
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