Answer:
-6.21
Step-by-step explanation:
One way of approaching this problem is to combine the negative values:
4.5 + ( -6.21) + (-4.5)
becomes:
4.5 + ( -10.71), or (performing the subtraction -10.71 + 4.5):
-6.21
Another way would be to combine 4.5 and -6.2, and then subtracting 4.5 from the result: 4.5 - 6.21 - 4.5 = -6.21
