Question

If a thermometer indicates 40 degrees Celsius, what is the temperature in degrees Fahrenheit?

A. 72°F
B. 104°F
C. 54°F
D. 22°F

Answer 1

Option B is correct.

Temperature in degree Fahrenheit is,
`104 ^(\circ)F`

Explanation:

We will use the temperature conversion formula from
`^(\circ)C` to
`^(\circ)F` as follows:

`F =(9)/(5)C+32`

where

F is the Fahrenheit in degree,

C is the Celsius in degree.

Given the statement: If a thermometer indicates 40 degrees Celsius.

⇒
`C = 40^(\circ)`

Substitute this value in above formula to solve for F;

`F =(9)/(5)(40)+32`

`F =72+32`

Simplify:

F = 104 degree.

therefore, the temperature in degree Fahrenheit is,
`104 ^(\circ)F`

Answer 2

If you want to convert 40 degrees Celsius to degrees Fahrenheit, you can do it this way:
40°C * 9/5 + 32 = 104°F

The correct result is B. 104°F.

Other options:
A. 72°F = 22.2°C
C. 54°F = 12.2°C
D. 22°F = -5.56°C