The 17th term of an Arithmetic sequence is 51. If the commons difference is 7, what is the first term ?

The first term is:

Step-by-step explanation:

The arithmetic sequence is defined by

where

is the first term

is the common difference

as

the 17th term of an arithmetic sequence is 51.

i.e.

so

        ∵ , ,

                  ∵

Therefore, the first term is:

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126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²