6.2×10³ - 4.8×10³
is the same as writing:
6200 - 4800.
The answer to 6200 - 4800 is 1400.
The answer is 1400, or 1.4×10³.
Well this could be incredibly easy, by just saying
and
.
This is a completely valid case but nevertheless seems too easy. The requirements are probably that n and m are integers or natural numbers but since that was not specified such probable requirement ought not to be followed.
Hope this helps :)

Solving:
<span>First remove the parentheses:
</span>


<span>First solve the multiplication:
</span>

<span>Do the subtraction, obeying the rule of signs of the greatest number:
</span>


<span>
</span>
solution:
= $15 for 3 packages
= 5 packages per dollar (15/3)
Answer:
work is attached and shown