Question

Question #bed84

Answer 1

-10.5 or -11 depending on significant figures.

Explanation:

`0 C^o = 32 F^o` So it is necessary to subtract 32 from the Franheit degrees to get the equivalent Centagrade value.

`13 - 32 = -19`

The ratio between Franheit and Centagrade is `(5 C)/ (9 F)` or
`(9 F)/(5 C)`.

( Water freezes at 32 F and boils at 212 F a change of 180)
(Water freezes at 0 C boils at 100 C a change of 100)
( `100/180 = 5/9`)

So multiplying -19 by the ratio `5/9` gives the value of degrees C

`-19 xx 5/9 = - 10.5555.....`

Rounding off to three digits assuming 13.0 gives

-10.5

Rounding off to two digits for two significant digits gives

`-11 C^o`