Make use of the fact that side lengths in similar triangles are proportional.
.. 30/18 = (20 +x)/20
.. 20*(30/18) -20 = x . . . . multiply by 20, subtract 20
.. 33 1/3 -20 = x . . . . . . . . evaluate the product
.. 13 1/3 = x
True the output or dependent variable is on the y (vertical) axis
Right ankle is exactly 90 degrees, while obtuse is more than, and acute is less than
<span>8 1/2 divided by 5 2/3 is </span>1 1/2
