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charle [14.2K]
3 years ago
9

The average of Paula's two test scores must be 80 or more for her to get at least a B in the class. She got a 72 on her first gr

ade. What grades can she get on the second test to make at least a B in the class?
a) at least 76
b) at least 84
c) at least 88
d) at least 92
Mathematics
1 answer:
KengaRu [80]3 years ago
7 0
The answer should be: B) at least 84

*HOPE I HELPED!* :)
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We assume the two numbers are x and (x+1)
so x^2+(x+1)^2=421
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According to the formula of quadratic 
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