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Mathematics 20 Online
OpenStudy (anonymous):

CALC. Help please!

OpenStudy (anonymous):

If dy/dx = x cos x2 and y = −3 when x = 0, when x = π, y = ___

OpenStudy (anonymous):

@eliassaab

OpenStudy (anonymous):

a. -3.215 b. √2 c. 1.647 d. 6 e. 3π

OpenStudy (anonymous):

\[ y=\int x \cos \left(x^2\right) \, dx=\frac{\sin \left(x^2\right)}{2}+C\\ y(0)=C=-3\\ y=\frac{\sin \left(x^2\right)}{2}-3\\ \]

OpenStudy (anonymous):

I got a?

OpenStudy (anonymous):

\[ y(\pi)=\frac{\sin \left(\pi ^2\right)}{2}-3=-3.21515 \]

OpenStudy (anonymous):

a is right

OpenStudy (anonymous):

Cool! Thank you! Can you quickly check my answer to this one? Suppose an experimental population of amoeba increases according to the law of exponential growth. There were 100 amoeba after the second day of the experiment and 300 amoeba after the fourth day. Approximately how many amoeba were in the original sample? I got 33.

OpenStudy (anonymous):

Post it as a new problem and tag me in it. People would be confused about which problem we are talking about

OpenStudy (anonymous):

Okay.

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