Hi,
Work:
Equation;

Collect like terms and calculate sum of positive numbers.

Move constant +63 to the right side and change its sign.

Subtract numbers.

Divide both sides of equation with 13.

Hope this helps.
r3t40
1/5 of them which is 6
6 students got an a
Answer:
a) 
Step-by-step explanation:
To find the length of all three sides, you have to use the Distance Formula:
![\displaystyle \sqrt{[-x_1 + x_2]^2 + [-y_1 + y_2]^2} = D](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csqrt%7B%5B-x_1%20%2B%20x_2%5D%5E2%20%2B%20%5B-y_1%20%2B%20y_2%5D%5E2%7D%20%3D%20D)
<em>D</em>[2, 6], and <em>B</em>[−2, 3] → <em>DB</em>
![\displaystyle \sqrt{[-2 - 2]^2 + [-6 + 3]^2} = \sqrt{[-4]^2 + [-3]^2} = \sqrt{16 + 9} = \sqrt{25} = 5](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csqrt%7B%5B-2%20-%202%5D%5E2%20%2B%20%5B-6%20%2B%203%5D%5E2%7D%20%3D%20%5Csqrt%7B%5B-4%5D%5E2%20%2B%20%5B-3%5D%5E2%7D%20%3D%20%5Csqrt%7B16%20%2B%209%7D%20%3D%20%5Csqrt%7B25%7D%20%3D%205)
<em>DB</em><em> </em>is 5 units long.
<em>E</em>[3, 2] and <em>B</em>[−2, 3] → <em>EB</em>
![\displaystyle \sqrt{[-3 - 2]^2 + [-2 + 3]^2} = \sqrt{[-5]^2 + 1^2} = \sqrt{25 + 1} = \sqrt{26}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csqrt%7B%5B-3%20-%202%5D%5E2%20%2B%20%5B-2%20%2B%203%5D%5E2%7D%20%3D%20%5Csqrt%7B%5B-5%5D%5E2%20%2B%201%5E2%7D%20%3D%20%5Csqrt%7B25%20%2B%201%7D%20%3D%20%5Csqrt%7B26%7D)
<em>EB</em><em> </em>is
units long.
<em>E</em>[3, 2] and <em>D</em>[2, 6] → <em>ED</em>
![\displaystyle \sqrt{[-3 + 2]^2 + [-2 + 6]^2} = \sqrt{[-1]^2 + 4^2} = \sqrt{1 + 16} = \sqrt{17}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csqrt%7B%5B-3%20%2B%202%5D%5E2%20%2B%20%5B-2%20%2B%206%5D%5E2%7D%20%3D%20%5Csqrt%7B%5B-1%5D%5E2%20%2B%204%5E2%7D%20%3D%20%5Csqrt%7B1%20%2B%2016%7D%20%3D%20%5Csqrt%7B17%7D)
<em>ED</em> is
units long.
Altogether, you have the perimeter of
units.
I am joyous to assist you anytime.
* Since we are talking about distance, we ONLY want the NON-NEGATIVE roots.