Answer:
B and C
Step-by-step explanation:
To figure out the average of all of the scores, you add all of the numbers together and then divide by how many numbers there are. The average shows about how well they did. Anne's friends average was 90 and was higher than Joan's friends average which was 75. Then the lowest score was definitely 78. So the answer would be B and C.

So :

Subtract the sides of the equation minus 11

Multiply the sides of the equation by 9


Divided the sides of the equation by 10

So :

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And we're done.
Thanks for watching buddy good luck.
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