Q. 84.3( 215 Votes )

# In countries like

Answer :

(i) Given: When C = 0 then F = 32,

And

When C = -10 then
F = 9(-2) + 32
= - 18 + 32
= 14

Now plotting the two points (0, 32) and (-10, 14)  (ii) Putting the value of C = 30 in F = ( ) C + 32, we get

F = × 30 + 32

F = 54 + 32

F = 86

(iii) Putting the value of F = 95 in F = ( )C + 32, we get

95 = ( )C + 32

( )C = 95 - 32

C = 63 × C = 35

(iv) After putting the value of F = 0 in

F = ( ) C + 32,

We get:

0 = ( ) C + 32

( ) = -32

C = -32 × 5/9

C = Putting the value of C = 0 in

F = ( ) C + 32,

We get:

F = ( ) × 0 + 32

F = 32

(v) We have to find when F = C

Hence,

After putting F = C in

F = ( )C + 32,

We get:

F = ( )F + 32

F – ×F = 32  F = 32

F = – 40

Therefore at value -40,

Fahrenheit and Celsius both are numerically the same.

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