There are 142506 ways in which 5 students can be selected out of 30 students.
<h3>How can a certain number of individuals be selected using a combination?</h3>
The selection of 5 students out of 30 students can be achieved with the use of combination since the order of selection is not required to be put into consideration.
By using the formula:

where;
- n = total number of individual in the set = 30
- r = number of chosing individuals to be selected = 5



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Y=9(x^2+3x-x-3)
y=9(x^2+2x-3)
y=9x^2+18x-27
D. since if you plug in the Pythagorean therom it comes out true and the Pythagorean therom only works on right triangles. also isosceles have 2 side lengths the same.