Question

The following table shows the temperature T(d) in degree Fahrenheit over a period of seven days, where d represents the day

Answer 1

Solution:

Given the table below:

The average rate of change of the temperature from day 1 to day 3 is expressed as

$rate\text{ of change = }\frac{T(d)_3-T(d)_1}{d_3-d_1}$

where

$\begin{gathered} T(d)_3=89 \\ T(d)_1=78 \\ d_3=3 \\ d_1=1 \end{gathered}$

By substitution, we have

$\begin{gathered} rate\text{ of change =}\frac{89-78}{3-1} \\ =\frac{11}{2} \\ \Rightarrow rate\text{ of change = 5.5}\degree\text{ per day} \end{gathered}$

Hence, the correct option is