Question

The label on the car's antifreeze container claims to protect the car between −30°C and 130°C. To convert Celsius temperature to Fahrenheit temperature, the formula is:
C = 5/9(F − 32). Write and solve the inequality to determine the Fahrenheit temperature range at which this antifreeze protects the car.

A.) -30>5/9(f-32)>130; -22>f>266

B.) -30<5/9(f-32)<130; -22
C.) -30<5/9(f-32); -22
D.) 5/9(f-32)<130; f<266

Answer 1

Plugging A in, we know that C (aka 5/9(F − 32)) has to be between -30 and 130, so the first part is right. Plugging -22 and 266 Fahrenheit in, we want to make sure that they equal -30 and 130 Celsius respectively. Plugging it in, we get -30 and 130, which works!