B. would be your answer, I'm almost 100% sure.
Brainliest?
It would mean a lot!
By the law of cosines, the angle

satisfies

which reduces to

which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).
Answer:
value of 'm' equal to 5 will produce no solution as they'll be parallel lines
value of 'b' equal to 5 will produce no solution because it will be the same line
Step-by-step explanation:
50 divided by 12.5 is 4
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Try to find the common factor which is 2.
So:
Multiply by 2 both variables in parenthesis and you get:
2*(l+w)