Determine whether the sequence is arithmetio.
an = 9n2+ 3
A) Arithmetic
B) Not arithmetic

B.

Step-by-step explanation:

If n = 1 ,  a1 = 9^1^2 +3 = 12

a2 = 9*2^2 + 3 = 39

a3 = 9*3^2 + 3 = 84

The differences are 39 - 12 = 27 and 84 - 39 = 45   so it is not arithmetic as an arithmetic series ad a common difference.

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step-by-step explanation:

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: