<h2>
Answer:</h2>
The radius of the cone is:

<h2>
Step-by-step explanation:</h2>
The total area of cone is given by:

where r is the radius of the cone and l is the slant height of the cone.
and the lateral area of cone is given by:

Hence, from equation (1) and (2) we have:

i.e.

i.e.

The answer is a) 12m^3 + 10n^2
Sum is

r=common ratio
a1=first term
it looks like 2^0=1 is the first term aka a1
it goes to the 9th term (2^9)
sub



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