Question

Solve:

-7.2 – (+3.8)

Answer 1

doesn't anyone own a calculator?

Answer 2

-4.3

Answer 3

\(-7.2-3.8=-(7.2+3.8)=-11\)

Answer 4

http://www.wolframalpha.com/input/?i=-7.2-3.8

Answer 5

not sure where the \(4.3\) came from
if the signs are both negative, ignore the signs, add, and then stick a minus sign out front
for example \(-10-20=-30\)