Answer :
16.3 - (-4.2) + 15.9
Subtracting (or multiplying) negatives makes them positive. So we rewrite:
16.3 + 4.2 + 15.9 = 36.4
Subtracting (or multiplying) negatives makes them positive. So we rewrite:
16.3 + 4.2 + 15.9 = 36.4