Vlad did not make a mistake.
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.
C is 3/5. D is 1. B is underlined
Answer:

Step-by-step explanation:
Given equation:

Divide both sides by 5:

Cube both sides:




Add 4 to both sides:

Divide both sides by 3:

X = 5 and 2x = 10
the only solution is 5, can be any number