Answer:
D
Step-by-step explanation:
Answer: 706.5
Step-by-step explanation:
First you have to square the radius. So for this question you multiply 5x5. That makes 25. Then you multiply that with pi ( 3.14 ) and that makes 78.50. Next you multiply it by 9, that makes 706.5.
4x^2+12x+7x
4x^2+19x
Was it meant to equal something or are you just simplifying the equation?