Iwill give brainliest to whoever got the right answer first, so get it right, me do number 25, number 26, and number 27, remember and , read the directions.

25. 16x + 9x + 5 = 180 because the angles are supplementary.
25x + 5 = 180
25x = 175
x = 7
Now because there are vertical angles, it is easy to find the value of y.
4y = 9(7) + 5
4y = 63 +5
4y = 68
y = 17

26. 6x - 11 + 2x - 9 = 180 because the angles are supplementary.
8x - 20 = 180
8x = 200
x = 25
Now because there are vertical angles, you can find the value of y.
6(25) - 11 = 20y + 19
150 - 11 = 20y + 19
139 = 20y + 19
120 = 20y
y = 6

27. 9x + 2 + 10x + 7 = 180 because the angles are supplementary.
19x + 9 = 180
19x = 171
x = 9
Again, there are two vertical angles.
10(9) + 7 = 18y + 25
97 = 18y + 25
72 = 18y
y = 4

I really hope this helped you!! :)

The answer is biodiversity resulting from new ancestors.