Turn on thread page Beta

Arithmetic and Geometric progressions HELP watch

    • Thread Starter
    Offline

    1
    ReputationRep:
    can anyone help me with this questions please.

    4. In a geometric progression the sum of the first 2 terms is 108 and the sum of the third and fouth is 12. Find the two possible values of the common ration and their corresponding first terms. 6 marks

    6.A pump is used to extract air from a bottle. The first operation of the pump extracts 56cm cubed of air and subsequent extractions follow a geometric progression. The third operation of the pump extracts 31.5 cm cubed of air.

    a) Determine the common ration of the geometric progression and calculate the total amount of air tht could be extracted from the bottle, if the pump were to extract air indefinitely. 5 marks

    b) After how many operations of the pump does the total amount of air extracted from thr bottle first exceeds 220 cm cubed. 5 marks
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    What have you done so far?
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 28, 2011
Poll
Cats or dogs?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

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