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Mathematics 22 Online
kaylak:

help

kaylak:

@Vocaloid

kaylak:

@Vocaloid

Vocaloid:

Please post your question

kaylak:

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kaylak:

i plotted yesterday but they all look the same

kaylak:

?

Vocaloid:

1 attachment
kaylak:

that's what i got but 12 is the period i know that

Vocaloid:

judging by this graph - the period is 12 and the amplitude is about 4, so we can eliminate C and D let's try and think about the horizontal shift

kaylak:

im thinking b

kaylak:

a looked correct when i graphed it

Vocaloid:

hm - if we change the function to cos this is what we get

Vocaloid:

notice how it starts decreasing from 0 instead of increasing like the actual function

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kaylak:

okay could you help with more this topic is kind of confusing

kaylak:

@Vocaloid

kaylak:

@sillybilly123

kaylak:

is it a

sillybilly123:

it's a negative cosine function with some shifting up the y - axis

kaylak:

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kaylak:

@sillybilly123

kaylak:

@sillybilly123

sillybilly123:

so this looks like a negative sine function |dw:1518720857562:dw| you just gotta roll with it

sillybilly123:

period is: trough to trough; or peak to peak. which is about 10 amplitude is sorta 47 - (-4) seems to have a period of about 10 so you just roll from there

kaylak:

well that is still all choices that follow that

kaylak:

@sillybilly123

sillybilly123:

not really it is in the form \(y = - A \sin (kx) + y_o\) and \(y_o \approx 26\) So \(y - 26 = - A \sin (kx) \) And then you can add in an amplitude: \(y - 26 = - (44 - 4) \sin (kx) \) for k ,you have \(k = \dfrac{2 \pi}{\lambda}\) And: \(\lambda \approx 10\), which was the approximation mentioned above etc

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