Plotting exponential function

A

Anthonyk2013

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Sep 15, 2013
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Wondering if my coordinates are correct, finding it hard to graph.
 

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For other viewers, the text in the sideways graphic appears to be as follows:

i) Plot a graph of y = 4e-2x over the range x = 0 to x = 3 in intervals of 0.5.
ii) Estimate the area under the curve plotted in (i) using the Trapezoidal Rule with six intervals.

i) x = 0, y = 4
x = 0.5, y = 1.47
x = 1, y = 0.54
x = 1.5, y = 0.2
x = 2, y = 0.07
x = 2.5, y = 0.26
x = 3, y = 0.009
Click to expand...
Note to poster: Something looks wrong about the sequence of y-values for x = 2, 2.5, 3. Is the y-value for x = 2.5 perhaps supposed to be something like 0.06? Or 0.006? ;)
 
stapel said:
For other viewers, the text in the sideways graphic appears to be as follows:


Note to poster: Something looks wrong about the sequence of y-values for x = 2, 2.5, 3. Is the y-value for x = 2.5 perhaps supposed to be something like 0.06? Or 0.006? ;)
Click to expand...

You have errors. Come to an agreement that you will round your function values to the
nearest two decimal places, because you will be plotting them on paper I imagine.

i) x = 0, y = 4
x = 0.5, y = 1.47
x = 1, y = 0.54
x = 1.5, y = 0.2
x = 2, y = 0.07
x = 2.5, y = 0.26 \(\displaystyle \ \ \ \ \ \)y actually equals 0.0269...
x = 3, y = 0.009 \(\displaystyle \ \ \ \ \ \)y actually equals 0.0099...
Click to expand...

The y-value that the OP has for x = 2 rounded to two decimal places is not incorrect.

Change it to:

x = 2.5, y = 0.03
x = 3, y = 0.01
 
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