Here is you're answer:
In order to get the answer you have to find the common denominator then add.

- Find common denominator:

- Add:


- Simplify:


Therefore you're answer is "1/3."
Hope this helps!
When any lines are parallel that means they have the same slope so the slope of the red line would also have a slope of -3/7
It is based off of the angles of the triangle and the sides.
A triangle with a right angle (90°) is a right triangle.
A triangle with an angle larger than 90° is an obtuse triangle.
A triangle with angles that are smaller than 90° is an acute triangle. ALL ANGLES MUST BE SMALLER THAN 90°...
With sides, if a triangle has two angles that equal the same length, it is an isosceles triangle.
If NO sides are of equal length, it is a scalene triangle.
And if ALL sides are equal, then it is a equilateral triangle.
Let the side of one edge of tile = a cm.
So area of tile = (side)^2 =
But area of tiles = 900 square centimeter.
So


So side of one edge of tile is = 30 cm