Question

Starting at noon, the temperature dropped steadily at a rate of 0.8 degrees celsius every hour. How many hours did it take for the temperature to decrease by 4.4 degrees Celsius?

Answer 1

5.5 hours

Explanation:

i used the variables
`t` and
`h`.
`t` represents the temperature and
`h` represents the hours

`t=0.8h`

you can substitute
`t` with 4.4.

`4.4=0.8h`

then divide each side by 0.8.

`5.5=h`

Answer 2

For this case we have that the temperature drops steadily at a speed of
`0.8 \frac {degrees} {hour}`, that is, every hour drops 0.8 degrees. So, we can propose a rule of three:

1 hour ----------> 0.8 degrees

x ------------------> 4.4 degrees

Where the variable "x" represents the number of hours that must pass for the temperature to decrease by 4.4 degrees.

`x = \frac {4.4 * 1} {0.8}\\x = 5.5`

Thus, for the temperature to decrease by 4.4 degrees, 5.5 hours must pass.

Answer:

5.5 hours