Answer:
18
Step-by-step explanation:
f(x)=2x(2+1)
f(3)=2(3)(2+1)
=6(2+1)
=12+6
=18
10
10 / 12
simplified:
5/6
since 5 is a prime number, we can't simplify this ratio any further
A=πr^2
=3.142×11.2^2
=3.142×125.44
=394.13cm^2
