Hello There!
It is Arithmetic.
Hope This Helps You!
Good Luck :)
Answer:
Sorry I can't speak Spanish. Can you please transalate your answer to English so that I can help you?
Step-by-step explanation:
I would say (C.) because the scientist only looked for the presence for both not just nickel or just lead.
Hope that helps.......if wrong I apologize.
4x = 17+5
x = 22/4
x = 11/2 = 5.5