Here, you simply need to make sure both fractions have common denominators!
Denominator = bottom number
10 and 2 are denominators!
So, let's look at them. 10 is not the same as 2.
The ONLY way to make them the same is multiplication.
So, since 10 is the bigger number, we'll leave it alone. Let's look at 2.
Can 2 become 10? Yes! How? Multiply 2 by 5!
2 x 5 = 10
Now let's look at the fraction!
1/2 --> ?/10
If we multiplied 2 by 5, then we also have to multiply 1 by 5!
1/2 --> 5/10
So now you've got:
7/10 + 5/10
Add the numerators (top numbers) together.
7+5 = 12
When adding/subtracting, the denominators always stay the same!
12/10 = your (unsimplified) answer.
Now we have to simplify it. How? Divide the top and bottom by 2!
12/2 = 6 10/2 = 5
So your simplified answer would be 6/5 !
Hope this helped!
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In this question, it's asking you to find the number when 90 is subtracted by 35%. So, you find 35% of 90 which is 31.5 and you minus it from 90 = 58.5.
Since all the sides add up to 10x+2, that means that 10x-2-<side1>-<side2>=<side3>. Plugging it in, we have 10x-2-5x-(2x+9)=side3, and 5x-2-(2x+9)=side3, then expanding it to 5x-2-2x-9=3x-11=side3
