Answer:
domain = ( 3, 11, 121, 34, 23)
range = ( 21, 34, 1, 23)
X=9.3 is the answer to the question
52 i believe.
42 + 45 + 58 + 63 = 208
208 / 4 = 52
₇P₅ is a permutation. you can find this setting in the statistics menu of your scientific calculator (i think).
If you don't have a scientific calculator, you can use the following formula:
nPr = 
₇P₅ = 
= 
= 
= 7 * 6 * 5 * 4 * 3
= 2520
Answer: C
use a calculator instead of asking