Answer:
62.83
Step-by-step explanation:
Circumference=2 pi r
diameter=20
20*pi= about 62.83
so it sould be around 62.83
A(t)=1350(0.9)^t
i hope this helps :)
x = -1/2
Even Numbers -2, 2, 4, 6, 8, 10, 12
Odd numbers - 3,-1,1,3,5,7,9,11