Answer:
6 4/7
Step-by-step explanation:
since you are diving fractions you convert all mixed numbers into improper fractions and you do the reciprocal. Which is just stating flip the second fraction.
so 3 3/4 is 15/4
so your equation reads :
15/4 times 12/7
you can cross cancel and it would reduce to
15/1 times 3/7 which equals to 45/7 which reduces to 6 4/7
The number of points Marco needs to bring his average up to 90% is 15points.
If there's a possible 25 possible points, and Marco has taken 5 quizzes;
Evidently, each quiz has weighs 5 points.
Mathematically;

- 2100 + 500x = 2250 + 450x
x = 3.
Therefore, he needs 5x points = 15 points to bring his average up to 90%.
Read more:
https://brainly.in/question/24249798
Answer:

Step-by-step explanation:

When there is a ( - ) in front of an expression in Parentheses, change the sign of each term
⇒
Calculate
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Hope I helped!
Best regards!!