Let's begin by listing out the information given to us:
There are four students: n = 4
Number of students to be selected: r = 2
To calculate the combination of 2 students to be chosen, we use:

Therefore, there 12 possible combinations from these
Answer:
I think it is B, AB or CD and AB || CD
Step-by-step explanation:
17. Area of triangle: 1/2bh
1/2 * 12 * 15
1/2 * 180
=90 cm^2
18. Area of trapezoid: 1/2 h (b1 + b2)
1/2 * 8 ( 12 + 15.4)
4 * 27.4
= 109.6 cm^2
Answer:
40 + ( -63) is less
Step-by-step explanation:
.... .....
Answer:
D) (–5,0), (0,2), (5,0), (0,–2)
Step-by-step explanation:
The vertices are basically the x and y intercepts.