Question

I have a question on related rates problem

Answer 1

Write the question. :) Everyone is waiting for you.

Answer 2

A cylindrical tank of radius 2.5 feet is being drained of water at a rate of 0.25 ft3/sec. How fast is the height of the water decreasing?

Answer 3

Wait i actually figured this one out.... i have a question on a more complicated one

Answer 4

please help!!

Answer 5

Ok well i think you could solve the changing rate like this

Answer 6

and solve for c with a^2+b^2=c^2 to get the rate

Answer 7

that would give you the rate of c correct? but when it says person B starts walking 4 seconds after Person A does that matter?

Answer 8

yea thinking

Answer 9

I solved for C and got 3.6

Answer 10

hmm this is tricky let's try and think together on this k?

Answer 11

yes

Answer 12

ok I may have thought of a way, do you have an answer book or sheet to check your answers?

Answer 13

unfortunetly not

Answer 14

ok, and you have learned derivatives and implicit differentiation?

Answer 15

yeah... i took the derivative of pythagoreus theorum but don't know what to do next... i plugged in 500 for a and aprime as 2... and 300 for b and bprime as 3 and then c is 583.09 and left to solve for dprime

Answer 16

yup same ok so that will give us the rate for if they both were to go at the same time. however, B doesn't move until 4 seconds later, so for part a, the rate of difference for if a moves for 3 secs i think we could ignore B and simply use a and a' and c and d'

Answer 17

think that makes sense?

Answer 18

im confused

Answer 19

yea ok i'll show you what i mean, and it's a rather more guess than answer