Answer: 3
Step-by-step explanation:

Answer:
615.44 m²
Step-by-step explanation:
3.14(14)²= 615.44 m²
(z + 6) / 3 = 2z / 4
this is a proportion, so we cross multiply
(3)(2z) = 4(z + 6)
6z = 4z + 24
6z - 4z = 24
2z = 24
z = 24/2
z = 12 <==
Since it is 10 less and you are trying to find out your number, you add 10.
71+10= 81
So, your number is 81.