There are 24 students in a class. 8 of them are boys. How many girls are there?
2 answers:
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Since the 7 is in front of the parentheses you must multiply it by everything inside the parentheses. 7 times X is 7X and 7 times -2 is -14. Then you need to make the X be by itself on one side, to do that you have to add 14 to -14 to make it disappear, and also add 14 to the other side, to 28. Then you divide both sides by 7 to make X be by itself.
7(x-2)=28
7X-14=28
7x=42
X=6
7(x-2)=28
7X-14=28
7x=42
X=6
Here is you're answer:
In order to get you're answer you need to find the common denominator then add.
- Find the common denominator:
- Simplify:
-
Therefore you're answer is option D "13/24."
Hope this helps!