Answer:
25 Or A
Step-by-step explanation:
Answer:
E
Step-by-step explanation:
To find the answer, use
, and then use the equation
To find it's half life.
For 27) D
For 28) A
Hope that helps!
Answer:
60
Step-by-step explanation:
Im too lazy
180-117=63
3y+12+63+4y=180
7y+75=180
7y=105
y=15
4(15)=60
Can i get brainliest?