C. Because complementary angles are two angles whose sum equals 90 degrees so do 90-40=50 then 50x2= 100

This is an exact answer. the answer will be a bit larger than 20
Step-by-step explanation:
There is no option to choose from, but the knowledge of what irrational numbers are, would help cover this cost.
A rational number is a number that can be written as a simple fraction, a/b. Examples are 1/2, 5/6,...
If a number cannot be written as a simple fraction, then it is called irrational.
Example of irrational numbers: √2, π
5x+20+16
the expression is 5x+36