Question

he temperature decreased overnight by 15.2°C to a temperature of –12.8°C. Suppose t represents the temperature before it decreased.

Which equation can be used to represent this situation?

A.
t – 15.2 = –12.8

B.
t + 12.8 = –15.2

C.
t – 12.8 = 15.2

D.
t – (–15.2) = –12.8

Answer 1

you started with an unknown temperature, we will let this be t
the temperature dropped, meaning the temperature is lower, by 15.2 degrees, so we subtract it from our starting temperature so we have

t-15.2
we know the final temperature is equal to -12.8

so we put it together

t-15.2=-12.8