2(3+3) or 2(3)+6, so the answer is the third option. It’s just using the distributive property.
The umber 10.5 can be written as
==> 21 / 2
==> 42 / 4
==> 63 / 6
==> 84 / 8
==> 105 / 10
and many, many other ways.
They ALL have the same value.
0 + (6/10) + (8/100) + (5/1000)
A healthy 140 pound boy needs between 2,000 to 2,400 calories a day.
Hope that helps :)