The usefulness is that this data allows you to understand how well students perform with their instruction, based on a standardized test. The limitation is that the scores don't account for different situations that may affect the results you receive.
Answer:
its -1/5
Step-by-step explanation:
10:20 and 20:30 form a ratio
80,000 + 6,000 + 200 + 11 = 86,211 Hope this helped c: