Answer
$(a)$ See the image below
$(b)$ $y = -0.16786x + 19.89286$
$y$ stands for the mosquito positive rate and $x$ stands for the flow rate.
$(c)$ $y\approx8.1\%$
Work Step by Step
$(a)$ See the image above
$(b)$ We can find them using regression line and graphing calculators:
$y = -0.16786x + 19.89286$
Where $y$ stands for the mosquito positive rate and $x$ stands for the flow rate.
$(c)$ If $x=70%$
$y= -0.16786\times70 + 19.89286\approx8.1$
