Question

The temperature falls from 0 degrees to Negative 12 and one-fourth degrees in 3 and one-half hours. Which expression finds the change in temperature per hour? HURRY I ONLY HAVE 20 MIN PLEASE PLEASEEEEEEE

Answer 1

-3.5 degrees per hour

`- 3.5t`

Explanation:

The total change is temperature is -12.25 degrees.

The total time is 3.5 hours.

This means that temperature changes by -3.5 degrees per hour (-12.25 degrees ÷ 3.5 hours).

As an expression of hours, simple multiply the coefficient by a variable. I'm assuming the letter t for time (where t is the number of hours):

`- 3.5t`

Answer 2

The change in temperature per hour is 3.5°/hr or 7/2° per hour

Explanation:

Given

The temperature falls from 0° to -12¼° in 3½ hours

This translates to the following;

Initial temperature, t1 = 0°

Final temperature, t2 = -12¼°

Time taken, t = 3½ hour

First, we calculate the change in temperature

Let ∆T represent change in temperature

∆T = Initial Temperature - Final Temperature

∆T = t1 - t2

∆T = 0° - (-12¼°)

∆T = 0° + 12¼°

∆T = 12¼°

Rate of change of temperature per hour is calculated by dividing the change in temperature by time taken.

The express is as follows;

∆T/t

By substituton.

Rate of change = 12¼ ÷ 3½

Rate of change = 3.5°/hr

Hence, the change in temperature per hour is 3.5°/hr or 7/2° per hour