Answer:
Step-by-step explanation:
x = 8
Answer:
25
Step-by-step explanation:
pythagorean theorem
a^2+b^2=c^2
7^2+24^2=c^2
square root of 49+576 =c^2
square root of 625 =c^2
25=c
A group of k elements can be chosen from a group of n elements in

ways.

There are 20 different 3-member groups.
When you multiplied 4 and 12, the answer is not 36.