Closed surface A is a sphere of radius R , closed surface B is a sphere of radius 2 R , and closed surface C is a cube with side
1 answer:
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Answer:
Step-by-step explanation:
80 x 4 = 79+81+77+x
320=237 + x
320-237 = x
83=x
so Marianne must score 83 points or higher on her last test