Answer:
The answer to your question is: T = 30°C
Step-by-step explanation:
Data:
T = 86°F
T =  ? °C
a. Write the formula for Temperature from your text:
            °C = (°F -32)/ 1.8
b. Solve that formula for C (hint: see example 3)
            I don't know which is the example 3
c. Now use your new formula from b to find the temp in Celsius if it is
86o F.
            °C = (86°F - 32) / 1.8     substitution
               = 54/1.8            simplifying
               = 30               result
