Question

1
The temperature falls from 0 degrees to -12 degrees in 32 hours. Which expression finds the change in
temperature per hour?
7 49
O24
7 49
0-25
49 7
oĀ x
49 7
O"42

Answer 1

Answer:

D. $Rate = -\frac{49}{4}^{\circ} /\frac{7}{2}\ hr$

Step-by-step explanation:

Given

$T_1 =0^{\circ}$

$T_2 =-12\frac{1}{4}^{\circ}$

$Time = 3\frac{1}{2}\ hr$

Required

Determine the change in temperature per hour

This is calculated as:

$Rate = \frac{T_2 - T_1}{Time}$

$Rate = \frac{-12\frac{1}{4}^{\circ} - 0^{\circ}}{3\frac{1}{2}\ hr}$

$Rate = \frac{-12\frac{1}{4}^{\circ} }{3\frac{1}{2}\ hr}$

Convert to improper fractions

$Rate = \frac{-\frac{49}{4}^{\circ} }{\frac{7}{2}\ hr}$

Express as:

$Rate = -\frac{49}{4}^{\circ} /\frac{7}{2}\ hr$