Answer
30 degrees Celsius
Work Step by Step
Use the formula $$C=\frac{5}{9}(F-32)$$ to convert 86 degrees Fahrenheit temperature to its equivalent temperature on the Celsius scale.
Start by substituting 86 for F in the equation
$$C=\frac{5}{9}(86-32)$$
complete grouped operations first
$$C=\frac{5}{9}(54)$$
since the $\frac{5}{9}$ is a fraction, turn the 54 into a fraction (by putting it over 1) so that you can multiply the two fractions:
$$C=\frac{5}{9}\times\frac{54}{1}$$
cross reduce the 9 with the 54 (both are divisible by 9)
$$C=\frac{5}{1}\times\frac{6}{1}$$
$$C=\frac{30}{1}$$
$$C=30$$
