His mistake was in multiplying the 3 with the 12. He should have divided it from the 12 because that would have gotten rid of the 3 with the variable. It would also lead to the correct answer, which is b=4

square root it and divide by pi. square root of 529 is 23. then divided by pi (3.14) is 7.32.
Answer:
0.055
Step-by-step explanation:
file is attached with explanation
Answer:
Given equation have two solutions.
x = 
Right option is (D)
Step-by-step explanation:
We have given,

we can rewrite this equation in the form given as:
6x² + 40 + 31x = 0
or 6x² + 31x + 40 = 0
On solving this quadratic equation, we get :
x = 
That means, given equation have two solutions.
Right option is (D)
Word Form:
three hundred fourteen thousand, two hundred seven
Expanded Form:
300,000+10,000+4,000+200+7