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solve the differential equations subject to the given conditions.

dy/dx= 4x^1/2 y=21 of x=4

is this derivative?!

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**antidervative

dy=4x^.5 dx

y= 2/3 * 4 x^1.5 + C

21=8/3 * 4^3/2 + C
21=64/3+C solve for C, then you have it.

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