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# Help on Algebra 2 Practice questions please, really confused :/

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These are some practice review questions for my test but I have no idea what I'm doing >.<

Mar 9, 2019

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1) Average rate of change is change in f(x) value divided by change in x values.

This is the gradient of the line joining the end points.

Mar 9, 2019
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so its -4/4 = -1 and so on??

cuzimvegan  Mar 11, 2019
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No that is not correct.

Average rate of change from x=5 to x=9 is

$$\frac{f(9)-f(5)}{9-5}$$

What is f(9) ?      What is f(5) ?    Look at the table.

No one answer over the top of me please.  I'm trying to teach.

Melody  Mar 11, 2019
edited by Melody  Mar 11, 2019
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But f(9)=f(9) and f(5)=f(5)... not really understanding what you mean ://

cuzimvegan  Mar 11, 2019
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F(9)=14        look at the table to see what I mean.

You have x on the first row and (x) on the second row.

When x=9 you look underneath the 9 to get the f(9) value.  It is 14.

Now you can tell me what f(5) is.

Melody  Mar 12, 2019