Answer:
In terms of pi: 243
in decimal form: 763.407
Step-by-step explanation:
to find surface area of a hemisphere the formula is,

diameter (d) = 18
radius = d / 2 = 18 / 2
radius = 9

Irrational is the correct answer
Answer:
x = 3 n, y = -2 n, n element Z
Step-by-step explanation:
Answer:
4200
Step-by-step explanation:
4280=(?)+80
So the answer is 4200