Will mark brainliest which expression is equivalent to −1.3 + (−4.9 ) + (−2.6) ? a. −(1.3 − 4.9) + (−2.6) b. (1.3 + 4.9 + 2.6) c. −1.3 + (4.9 + 2.6) d. −1.3 − (4.9 + 2.6)

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.

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Answer (D)