How do you find the surface area of a 3d object????

Mathematics

2 answers:

Igoryamba3 years ago

8 0

You should start by calculating the area of one of the faces of the chosen figure. Then proceed by doing the same thing till you've calculated the area of all the surfaces. Then all you have to do is add them up.

olga2289 [7]3 years ago

4 0

If you have enough info google can do all the work for you.

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Calculate the difference between the 1990-1997 average blue crab population and the 1998-2009 average blue crab population predi

Karolina [17]

The difference of the blue crab population From 1990-1997, the average was (800+750)/2 = 775; and from 1989-2009: (350+350)/2 = 350. I predict that from 2010 to 2020 the population will increase to about 500 because it seems to go on trends of increasing and decreasing.

5 0

4 years ago

Tim Worker is doing his budget. He discovers that the average electric bill for the year was $206.00 with a standard deviation o

ivanzaharov [21]

Answer:

-2.2
1.4%
-0.6
27.4%
26%

<h3>Step-by-step explanation:</h3>

The z-value is computed from ...

... z = (x -µ)/σ

... z = (184 -206)/10 = -2.2 . . . . for $184

... z = (200 -206)/10 = -0.6 . . . . for $200

You can look up these values in a normal distribution table, or you can use an appropriate calculator to find the corresponding percentiles.

... -2.2 corresponds to the 1.390 percentile. (That amount of area is below -2.2 standard deviations from the mean.)

... -0.6 corresponds to the 27.425 percentile.

Subtracting the two percentages gives the percentage of expenses between $184 and $200. That number is 26.035% ≈ 26%.

_____

<em>Comment on the calculator display</em>

The difference that got cut off from the display in the attachment is ...

... 0.2603496703

The <em>normalcdf( )</em> function requires a lower limit. Using -8 standard deviations is effectively equivalent to -∞ for this purpose, as any lower number has no effect on the least-significant digits of the result.