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RUDIKE [14]
3 years ago
7

What is the Area of an equilateral triangle whose sides are 8 feet long each?

Mathematics
1 answer:
Bess [88]3 years ago
5 0

Answer:

27.71281 ft

Step-by-step explanation:

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Write the pair of fractions as a pair of fractions with a common denominator of 3/4 and 2/3
garik1379 [7]

Answer:

3/4 = 9/12  2/3 = 8/12

Step-by-step explanation:

To find the common denominator you multiply by the opposite ones

3   •   3      9

__       =    __

4   •   3      12


2   •   4     8

_         =  ___

3   •   4      12

7 0
3 years ago
The sum of 2 numbers is 75. the second number is 3 less than twice the first. find the numbers
Eva8 [605]

Answer:

26 & 49 is the answer

5 0
3 years ago
A number plus 1/2<br><br><br> And a number minus .7
Alchen [17]
Try -.35 I am not sure but if it’s right go ahead
3 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
A solid oblique pyramid has a square base with edges measuring x cm. The height of the pyramid is (x + 2) cm.
sasho [114]

Answer:

Hello,

Answer A StartFraction x cubed + 2 x squared Over 3 EndFraction cm3

Step-by-step explanation:

V=x^2*\dfrac{x+2}{3} \\\\\boxed{V=\dfrac{x^3+2x^2}{3} }\\

the third of the sum of the cube of x and double of the square of x ( cm³)

6 0
3 years ago
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