B. -8
F(x) = -3x2 - 2x - 1
0 = -3x x 2 - 2x - 1
X= -8
Answer:
We find 3/4-5/24 = 0.54166666666 and try 2/7 x 6/8 = 0.21428571428
this is 0.069 too much we look at this as a fraction = 0.07 which is 1/10 approx of the 6/8. we then reapply 7/9 x 2/7 x 3/3 = 0.2
So we went up by 1 and can show another
2/7 x 7/10 = 2.0
So to 1dp there is lots of fractions including 2/7 x 7/9 = 2.0
But for three fractions that multiply together we can chose 5/7 x 2/6 x 6/6 = 2.0 As 5 x 2 x 6 = 60 and 60/360-102 = 60/258 = 0.20 and divided 198 =numbers 8 and 1/3 work with = 1.98/8.3 = 2.38554
We try again 1.68/8.3 = -0.2024 = 2/8 x 8/10 = 0.2
The balance is 1.3/2 x 0.8/2 = 0.65 x 0.333 = 13/20 x 1/3
3/5 x 1/3 = 0.2
The answer is 14. The two lower angles are 50 each 100 total and so the top angle must equal 80. If you set it equal to 80 you get 14.
