Answer:
130 expected hits
Step-by-step explanation:
520 attempts times 0.25 is 130
Step-by-step explanation:

Where Z is set of integer.
Answer:
its b
Step-by-step explanation:
Answer:
3
Step-by-step explanation:
-(x-4)+5=3x+6-x(BODMAS)
-x+4+5=3x+6-x(collect like terms )
4+5=3x+x-x
9=3x (divide both sides by 3)
9/3=3x/3
3=x