Answer:
i strongly believe the answer is (c)
Step-by-step explanation:
We'll solve this equation in order to find the score of the 4th test, which we denote with x.

. Solving it we find that x=63. And it is the final answer for this problem.
Answer:
She multiplied the dividend by 100 instead of 10.
Step-by-step explanation:
Ella multiplied the divisor by 10 but mistakenly she multiplied the dividend by 100 instead of 10.
So her division problem changed totally.
Therefore, the correct answer option is B. She multiplied the dividend by 100 instead of 10.