## Chapter 4

### Graphs and Functions

#### Section 4.1 (Answers)

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9. $d=\sqrt{{\left(8-2\right)}^{2}+{\left(9-4\right)}^{2}}=\sqrt{36+25}=\sqrt{61}$ $M=\left({x}_{m},{y}_{m}\right)=\left(\frac{2+8}{2},\frac{4+9}{2}\right)=\left(5,\frac{13}{2}\right)$

10. $d=\sqrt{{(5-3)}^{2}+{(0-1)}^{2}}$

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