Why does heat transfer use final minus initial instead of initial minus final?

[bluesteels]

Homework Statement

How much heat Q1 is transferred by 25.0 g of water onto the skin? To compare this to the result in the previous part, continue to assume that the skin temperature does not change.

Assume that water and steam, initially at 100∘C, are cooled down to skin temperature, 34∘C, when they come in contact with your skin

Relevant Equations

Q=mc delta
c = 4190

My work

Q= 0.025 * 4190 * (34-100) = -6910

but on chegg but did they do

Q= 0.025 * 4190 * (100-34) = 6910. I thought the initial is 100C and final is 34 because it goes from 100 to 34

 

[haruspex]

Homework Statement:: How much heat Q1 is transferred by 25.0 g of water onto the skin? To compare this to the result in the previous part, continue to assume that the skin temperature does not change.

Assume that water and steam, initially at 100∘C, are cooled down to skin temperature, 34∘C, when they come in contact with your skin
Relevant Equations:: Q=mc delta
c = 4190

My work

Q= 0.025 * 4190 * (34-100) = -6910

but on chegg but did they do

Q= 0.025 * 4190 * (100-34) = 6910. I thought the initial is 100C and final is 34 because it goes from 100 to 34

You did the correct calculation, final minus initial, for the heat gained by the water, which is negative. That is not what the question asks for.