You can remove the first plus sign to give: -1.3 -4.9 [ because + x - = - ] and by the same rule you can remove the the second plus sign to give -1.3 -4.9 - 2.6 That means option b is out because it is positive. straight away we can see that option D. equals the result, so it is in the running, so now can we eliminate c and a? we can eliminate a because the minus ign outside the bracket multiplied by -4.9 inside the bracket produces + 4.9, which is not the answer, so that only leaves c. once again, a plus sign outside the bracket does not produce -4.9 when muliplied by 4.9 inside the bracket inside option c, so we can eliminate option c.
