i) Given that F = 9/5 C + 32
C |
20 |
30 |
35 |
-40 |
F |
68 |
86 |
95 |
-40 |
If C = 20, F = 9/5 × 20 + 32 = 68
If c = 30, F = 9/5 × 30 + 32 = 86
If C = 35, F = 9/5 × 35 + 32 = 95
If C = -40, F = 9/5 × (-40) + 32 = -40
ii) From the graph 30°C = 86°F
iii) 95°F = 35°C iv) When C = – 40 then F = – 40