Jessica increases the temperature of a block of ice by 20º. Which integer represents the amount by which Jessica must change the temperature for the block of ice to return to its starting temperature?
–40
–20
20
40

Question

jakfishman · Answer

So Jessica just added of 20 degrees right so what would you need to do to get it back to original state?

SEAlgurl · Answer

yes

crispyrat · Answer

also its change. + or - matter

jakfishman · Answer

so we need to bring it down so how do we do that?