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appreciate all answers :)

 Apr 27, 2018
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Why don't you test your equation and see for yourself?

C =5/9[F - 32]. Try 20 degrees C and solve for for F

20 = 5/9F - 17 7/9

20 + 17 7/9 =5/9F

37 7/9 = 5/9F     multiply both sides by 9/5

F =37 7/9 x 9/5

F =3,060 / 45 =68 F.  Now, if you try 21 C and solve for F, you should get

F =69.8

So, 69.8 - 68 =1.8F. So, for every 1 degree C increase, you get 1.8 F increase.

Now, the reciprocal of that is true as well. In other words, for every 1 F degree increase you get 1/1.8 =5/9 C inrease.

So, the correct answer is "D" on your multiple choice list.

Note: Here is a trick in convering C to F in a very simple way. Suppose you want to convert 15 C to F.

Take 15 x 2 = 30. Then subtract 10% of 30 = 3 from itself. Or: 30 - 3 = 27 and to that you add 32. So:

27 + 32 = 59 F degees EXACTLY!!.

 Apr 27, 2018

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