Recent content by ISAM77

Can someone make a solution for this please. Would love to see it I tried multiple methods and couldn’t get there: 3 similar triangles, pythag (lol), external point products.

Ok yep. So solve for A=2root3 and a=pi/3 OR A=-2root3 and a=4pi/3 can see it now

To get the value of A in the solution we get A^2 = 12. Why do we only consider A=2root3 for the correct solution, instead of both positive and negative 2root3? example solution: I did everything the same except what I mentioned.

Thankyou :)

How/why do we get the line in the red box?

My brain is fried. Uh. such a silly thing to get stuck on. Literally 2u stuff

Why does du = (1+t^-2) dt

The enrichment questions always make me feel inadequate. I can't figure out part a). b) is done 👍 .

Perfect. Thankyou very much! It's all clear now

Maybe I'm missing something simple... "In the notation of the text". What does this mean?

Ok, awesome! I'll keep this in mind, and will look forward to learning multivariable calculus in the future :) Thanks very much

Struggling to see it unfortunately. I feel like I'm close, but just need someone to spell it out for me

Ok 👍 So what you're saying is, in this circumstance, dV/dt =/= dV/dr * dr/dt . Is that correct? Would this statement be true for the question above? (I know you can't solve the question using this statement. I just want to know if the statement is true)

I get that they're both changing over time. But why does that make them dependent on each other? e.g. you can increase the radius of a cone without changing the height of it. So the rates at which they are changing are independent are they not? Pls help me understand

Just doing some practice on Khan Academy. I'm just wondering why the working out on the right is wrong. If I use dV/dt = dV/dh * dh/dt , it also gives a different wrong answer. Why are these methods wrong?