Differential Calculus

Help me find the limits of these:

https://imgur.com/a/yobgF

Help me identify all asymptotes and the end behavior of the graph:

https://imgur.com/a/JxJF2

Guys may complete solution ba kayo sa mga problems sa DE..?

A 600 gallon brine tank is to be cleared by piping in pure water at 1 gal/min. , and allowing the well-stirred solution to flow out at the rate of 2 gal/min. If the tank initially contains 1500 pounds of salt, a) how much salt is left in the tank after 1 hour? b) after 9 hours and 59 min?

y=x^2+C1e^2x+C2e^3x

Thank you again

How to eliminate arbitrary constants
y=C1e^x+C2e^2x+C3e^3x

thank you :)

xdx + (sin²(y/x)(ydx-xdy)) = 0

The radial stress p at distance r for the axis of the thick cylinder subjected to internal pressure is given by p + r (dp/dr) = A − p where A is a constant. If p = p₀ at the inner wall r = r₁ and is negligible (p = 0) at the outer wall r = r₂ find an expression for p.

kindly help me with my homework. eliminate the following arbitrary constants...
y= x^2 + c1 e^3x + c2 e^3x.