1. anonymous

and the last to options are 6 and 8

2. mathstudent55

find the number of houses sold in day 10 find the number of houses sold in day 2 subtract the first number minus the second number; call this difference the "change in y" day 10 is 10 day 2 is 2 subtract the first number minus the second number; call this difference the "change in x" divide (change in y) / (change in x)

3. anonymous

$$\bf slope = {\color{green}{ m}}= \cfrac{rise}{run} \implies \cfrac{{\color{blue}{ y_2}}-{\color{blue}{ y_1}}}{{\color{red}{ x_2}}-{\color{red}{ x_1}}}\implies \cfrac{f(10)-f(2)}{10-2}\impliedby \textit{rate of change}$$