Find the 200th given the first term and the common difference a1=34 and d=15

We know that 
 In the Arithmetic Sequence, the  formula is
an=a1+(n-1)*d
where

an = the term that you want to find

a1 = first term in the list of ordered numbers

n = the term position
d = common difference of any pair of consecutive numbers

in this problem we have
 a1=34
d=15
so
for n=200
a200=34+(200-1)*15> a200=3019

the answer is
3019

267.45 sq units

Step-by-step explanation:

Area of shaded region = Area of Square minus Area of Circle

the sides of the square are twice the radius of 9, therefore 18

A(square) = 18² = 324

A(circle) = π9² = 81π ≈ 56.55

324 - 56.55 = 267.45