Misty took a multiple choice test in science that had 50 questions. if the relationship between the number she got correct and the number she got incorrect is 7: 3, and she got 9 incorrect, how many did she get correct?

In this case, the total number of questions in the test is 50. The possible outcome for the question would be answered wrong, answered correctly or not answered. To know the amount of the correct answer, you need to multiply the incorrect with correct/incorrect ratio. The equation would be:
correct 9 answer * 7/3= 21 answer.

Then for this test misty has:
9 incorrect answer
21 correct answer
20 blank/ not answered

Cthe residual plot for model 1 has a non random pattern and is a good fit for the data

< i think this is the answer unless i did my math wrong