Answer:

Step-by-step explanation:
, substitute
to x
=
or 3.75
=
= 
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➷ You have to collect like terms
In other words, add together the values that have x in them and add together the values that don't
4x + 7x = 11x
8 + 3 = 11
The answer is 11x + 11
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You're starting at 400. Each time you're cutting in half.
So the common ratio is 1/2 which means the equation is

which is in the geometric sequence format. So the answer is choice D