Turn on thread page Beta

Use of maths: differentiation - need help finding rate of change watch

    • Thread Starter

    This is really simple, and I think I've got it, but I just need confirmation as to whether I'm doing this right

    If, on a graph starting on the x axis at 8am, I am asked to find the rate of change at 10am do I simply enter t=2 into my dy/dx formula (dy/dx = 3.2 - 0.5t, from f = 42 + 3.2t - 0.25t^2) to make it 3.2 - 0.5(2) = 2.2?

    Does it say what f is at a particular value of t? You would need that to work out whether to use t=10 or t=2.

    What's 1 unit in your x axis? If 8am-10am is one unit, then t=1, if 8am-8.30am is one unit, then t=4.
Submit reply
Turn on thread page Beta
Updated: April 14, 2011
Is the Big Bang theory correct?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.