URGENT - sine graph help Can someone please answer my last question I posted. Thanks

Question:

I'm trying to graph a sine wave given different frequencies and I'm not sure how to.

Frequencies I am using: 261.625 Hz, 329.627 Hz, 391.995 Hz
I tried using the formula y(t)= sin (2πft) so the formula would be y(261.625)= sin 2π(261.625)t (using the first frequency), but it didn't work. I've seen people graph it as y= sin (261.625x)/(440) and I tried it and it works, but I don't understand how they got this formula/why to use it.

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step-by-step explanation:

x =-.20752

step-by-step explanation:

4^(x+2)=12

4^(x+2)=12

take the log base 4 on each side

log 4 (4^(x+2) = log 4(12)

we know log b(a^y) = y log b (a)

(x+2) log 4(4) = log 4 (12)

x+2 = log 4 (12)

we know   logb c = loga c/loga b

we want to convert to base 10   so a = 10

by default, we do not write the 10   c = 4   and b = 10

log4 10 = log 12/log 4

log4 10 = log 12/ log 4

x+2 = log 12/ log 4

subtract 2 from each side

x +2 -2 = log 12/ log 4 -2

x = 1.79248125 -2

x =-.20752