A group of k elements can be chosen from a group of n elements in

ways.

The answer is B. 495.
The answer is B, because 44 is greater than 42. I hope this helps!
Ok so from experience on this site
3x2=3x^2
people don't know how to put exponents
3x^2-y^3-y^3-z
simplify first
3x^2-2y^3-z
x=3
y=-2
z=-5
3(3^2)-2(-2)^3-(-5)
3(9)-2(-8)+5
27+16+5
48