Can someone help find the circumference and area of this??? ​

Step-by-step explanation:

area formula is

π

plug in values:

9π

which equals

28.2743339

or you can write 9π im not sure what your teacher prefers

circumference formula is

2πr

which equals

6π

or

18.8495559

goog may have it for you

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value