Question

Harry and Terry are each told to calculate 8−(2 5). Harry gets the correct answer. Terry ignores the parentheses and calculates 8−2 5. If Harry's answer is H and Terry's answer is T, what is H−T?

Answer 1

There is a sign missing, but I think it's a "+" like this:

8-(2+5)

H, ,that is Harry's answer would be:

first the bracket:

8-(7)

and then the whole expression:
8-(7)=1, so H=1

Terry's answer would be:

8-2+5, which we do from left to right:

6+5=11, so T=11

then H-T is 1-11, which is -10.