it would be a because nothing else makes sense
Answer:
its 7
Step-by-step explanation:
percentage error is .5/12 = 4.17%
Hope this helps!
~LENA~
4.47
3x²+31=91
3x²=91-31
3x²=60
x²=60÷3
x²=20
x=√20
x=4.47
