Answer:
b=i*
or -i*
Step-by-step explanation:
11b^2-9=-68
11b^2=-59
b^2=-59/11
b=i*
or -i*
"i" in this case is an imaginary number, equal to 
if you haven't learned about these yet, something is wrong with the question
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The total of all angles are 360 degrees for a parallelogram. One angle is 10 and the one opposite is also 10. B = 340/2=170 degrees