# Chapter 10 Functions, Graphs and Modelling

All solutions to Ex 10.1, 10.2 and 10.3 have now been posted on the blog.

## 6 thoughts on “Chapter 10 Functions, Graphs and Modelling”

1. Haley

Hellllooooo…
Yes, I’m not in your class but I’m still using your thinga ma jig MUHAHAHAHA.
In question 12 of 1.3 your little <‘s turn around sometimes but not other times. What makes them change?

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2. Haley

AND… in question 14. Why IS the negative answer acceptable?

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3. Haley

nevermind last bit i figuired it out

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4. Cassie

Thankyou! And I swear I’ve had this captcha before…

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5. In answer to your questions Haley, for Quest 12 you need to look at the required conditions. For example, for 3^x>9 the solution is x>2 ie any values of x over 2 will give an overall result of over 9 as required. So that answer is obviously one that has the > not “turned around” as you put it. However, what about 3^(-x)>9? Now for 3^(-x)=9 the solution is x=-2. What result would values of x>-2 give now? This solution would give us answers 9 as required. So we “turn around” the when we see the needed result. In this case the solution to 3^(-x)>9? is x<-2.

In Question 14 e, the answer can be negative as it is not log(negative number).

Hope that helps! ðŸ™‚

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