2b+15
2 dollars for each book so you multiply it by the number of books and add 15 because it is a one time fee.
Answer:
32
Step-by-step explanation:
12+13=25, 25+1=26, 26+6=32
Answer:
The killing curse
Step-by-step explanation:
Answer:
5.9 pounds
Step-by-step explanation:
3.8 + 2.1 = 5.9
Answer:
25.9 years
Step-by-step explanation:
The half life of an isotope is related to the actual amounts by the equation:
N = Ni*(1/2)^(t/HL)
where N and Ni are the final and initial (Ni) amounts, t is the time (in years for this problem) and HL is the half-life, in years.
In this problem, we can write:
100 = 360*(1/2)^(x/14)
I'll reduce this to:
1 = 3.6*(1/2)^(x/14)
This can be solved by taking the log of both sides.
x = 25.87 or 25.9 years
