Convert the following temperatures from Fahrenheit to Celsius or vice versa. a. 90°F b. 55°C c. - 20°C a. 90°F=| °C Туре an integer or decimal rounded to one decimal place as needed)

a. 32,2°C

b. 131 °F

c. - 28,9°C

Step-by-step explanation:

We must consider the following formula:

(x-32) * 5/9 = y, where x = temperature in °F an y = temperature in °C

Then,

a) In the formula we replace x=90° F, and we have: y = (90-32) * 5/9 = 32,2 °C

b) In the formula we replace y=55° C, and we have: 55 = (x-32) * 5/9 ⇒ 55*9/5 = x-32 ⇒ x = (55*9/5) + 32 = 131 °F

c) In the formula we replace y = - 20° C and we have: - 20 = (x-32) * 5/9 = - 4°F