Saturday

January 31, 2015

January 31, 2015

Posted by **Amy** on Wednesday, December 8, 2010 at 11:15pm.

Let f(x) =|9x|. For the area above the x-axis and between the lines x= -9 and x=18

a. draw and label a sketch with

the area shaded

b. find the area of the region in

the xy-plane under the graph

of f(x)

- Pre-Calc -
**MathMate**, Wednesday, December 8, 2010 at 11:36pmFor this kind of problem, it is always desirable to make a sketch within the limits of the domain, from x=-9 to 18.

See:

http://img510.imageshack.us/img510/2928/1291868155.png

Using the formula for the area of a triangle as:

Area = (1/2)base*height

You can find the areas of the two triangles between the function and the x-axis.

If you need further help, don't hesitate to post.

- Pre-Calc -
**Reiny**, Thursday, December 9, 2010 at 12:19amAmy, please check to see if your question has been answered before posting the same question again.

you asked the same question with only a small change yesterday,

http://www.jiskha.com/display.cgi?id=1291781963

MathMate has gone to some length to answer it again, even creating a picture for you.

make a note of your post by jotting down the time of the first posting, even though it moves off the page, it is then rather easy to find

- Pre-Calc -
**Amy**, Thursday, December 9, 2010 at 12:30amThank you for your help

**Answer this Question**

**Related Questions**

Pre-calc - Can someone please show me the steps to this problem...Thanks in ...

Pre-Calc - Seeking step by step help with this question...Thank you much. Let f(...

Pre-Calc - Find the area of the region between the graph of y=1/x, the x-axis, ...

brief calc - Calculate the total area of the region described. Do not count area...

Calc - Find the area between the x axis and the graph of y = (2e^x)/(1+e^(2x)) a...

Calculus - 1. Find the area of the region bounded by the curves and lines y=e^x ...

Pre Calc To Reiny - Follow up on Pre-Calc Answer - Pre-Calc - Follow-up for ...

Math - Use the definite integral to find the area between the x-axis over the ...

Pre Calculus - Can someone help me with this problem...I have no Idea how to do ...

Pre-Calc - Here I am again stuck with another geometry type question. Here goes...