It has 5 sides.
Hope this helps:)
Answer: ![\dfrac{4x^2-14x+10}{(x-5)(x+5)(x-3)}](https://tex.z-dn.net/?f=%5Cdfrac%7B4x%5E2-14x%2B10%7D%7B%28x-5%29%28x%2B5%29%28x-3%29%7D)
Step-by-step explanation:
Given
Subtract the expression
![\Rightarrow \dfrac{4x}{x^2-25}-\dfrac{2}{x^2+2x-15}\\\\\Rightarrow \dfrac{4x}{(x-5)(x+5)}-\dfrac{2}{x^2+5x-3x-15}\\\\\Rightarrow \dfrac{4x}{(x-5)(x+5)}-\dfrac{2}{(x+5)(x-3)}\\\\\text{Take the LCM and subtract}\\\\\Rightarrow \dfrac{4x(x-3)-2(x-5)}{(x-5)(x+5)(x-3)}\\\\\Rightarrow \dfrac{4x^2-12x-2x+10}{(x-5)(x+5)(x-3)}\\\\\Rightarrow \dfrac{4x^2-14x+10}{(x-5)(x+5)(x-3)}](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cdfrac%7B4x%7D%7Bx%5E2-25%7D-%5Cdfrac%7B2%7D%7Bx%5E2%2B2x-15%7D%5C%5C%5C%5C%5CRightarrow%20%5Cdfrac%7B4x%7D%7B%28x-5%29%28x%2B5%29%7D-%5Cdfrac%7B2%7D%7Bx%5E2%2B5x-3x-15%7D%5C%5C%5C%5C%5CRightarrow%20%5Cdfrac%7B4x%7D%7B%28x-5%29%28x%2B5%29%7D-%5Cdfrac%7B2%7D%7B%28x%2B5%29%28x-3%29%7D%5C%5C%5C%5C%5Ctext%7BTake%20the%20LCM%20and%20subtract%7D%5C%5C%5C%5C%5CRightarrow%20%5Cdfrac%7B4x%28x-3%29-2%28x-5%29%7D%7B%28x-5%29%28x%2B5%29%28x-3%29%7D%5C%5C%5C%5C%5CRightarrow%20%5Cdfrac%7B4x%5E2-12x-2x%2B10%7D%7B%28x-5%29%28x%2B5%29%28x-3%29%7D%5C%5C%5C%5C%5CRightarrow%20%5Cdfrac%7B4x%5E2-14x%2B10%7D%7B%28x-5%29%28x%2B5%29%28x-3%29%7D)
First, you add up the total number of students because we would base our percentage one this.
Total number of students = 1+4+5+10+20+10+5
Total number of students = 55
Now, let's count how many of them got a score of more than 70. For this, you would only count the students belonging to 70-under 80, 80-under 90 and 90-under 100.
Students who got more than 70 = 20+ 10 + 5 = 35
Therefore the percentage is equal to:
Percentage = 35/55 * 100 = 63.64%
Their GCF is 6 and the sum is 66
Step-by-step explanation:
Answer: 3• D 4• B (why does this require me to put 20 characters) anyway this is my guess