This looks like were trying to prove a pair of angles of an isosceles triangle are congruent.
To do that we need the fact that it's an isosceles triangle, which is AB=AC.
That's choice A.
None of the other choices make sense just by symmetry. AD=AC, nope the middle and the side, BD=AD, nope, AB=BD, nope.
choice A.
Answer:
d = 5
Step-by-step explanation:
d = 
d = 
d = 
d = 
d = 5
Answer:
it doesnt pull up full picture
Step-by-step explanation:
i dont know if this is with anyone else or just me
We're going to be using combination since this question is asking how many different combinations of 10 people can be selected from a set of 23.
We would only use permutation if the order of the people in the committee mattered, which it seems it doesn't.
Formula for combination:

Where
represents the number of objects/people in the set and
represents the number of objects/people being chosen from the set
There are 23 people in the set and 10 people being chosen from the set


Usually I would prefer solving such fractions by hand instead of a calculator, but factorials can result in large numbers and there is too much multiplication. Using a calculator, we get

Thus, there are 1,144,066 different 10 person committees that can be selected from a pool of 23 people. Let me know if you need any clarifications, thanks!
~ Padoru