Question

It's was 55°F outside until the temperature increased 20°F. Which number is the additive inverse of the temperature increase?

Answer 1

we know that

If two numbers have a sum of zero, then we say they are additive inverses

Let

x--------> the additive inverse of the increased of temperature

y-------->  the increased of temperature

we know that

$x+y=0$ ---------> equation

in this problem we have

$y=20\° F$

substitute the value of y in the equation

$x+20\° F=0$

Solve for x

$x=-20\° F$

therefore

the answer is

the additive inverse of the temperature increase is $-20\° F$

Answer 2

55+20=75ºF
I am very confused but I'm guessing.