Adult+student=170 ----(1)
5adult+3student=650 ----(2)
(1)*3; 3adult+3student=510 ----(3)
(2)-(3); 2adult = 140
so adult = 70
then student = 170-70 = 100
answer: Tammy sold 70 adult tickets and 100 student tickets
You have to make 4% into a decimal which is.04 then multiply 15600 x .04 which equals 624
Answer:
16
Step-by-step explanation:
Now:16 x 2 = 32
16 years:32 x 2 =64
64 / 2 = 32
Population density = population/area
Califonia = 36,500,000 / 163,707 = 223.0 persons per square mile
Florida = 18,300,000 / 65,758 = 278.3 persons per square mile
Iowa = 2,990,000 / 56,276 = 53.1 persons per square mile
New Jersey = 8,690,000 / 8,722 = 996.3 persons per square mile
Wyoming = 522,000 / 97,818 = 5.3 persons per square mile
Answer:
Explanation:
These steps explain how you estimate the age of the parchment:
1) Carbon - 14 half-life: τ = 5730 years
2) Number of half-lives elapsed: n
3) Age of the parchment = τ×n = 5730×n years = 5730n
4) Exponential decay:
The ratio of the final amount of the radioactive isotope C-14 to the initial amount of the same is one half (1/2) raised to the number of half-lives elapsed (n):
5) The parchment fragment had about 74% as much C-14 radioactivity as does plant material on Earth today:
- ⇒ ln (0.74) = n ln (1/2) [apply natural logarithm to both sides]
- ⇒ n = ln (1/2) / ln (0.74)
- ⇒ n ≈ - 0.693 / ( - 0.301) = 2.30
Hence, 2.30 half-lives have elapsed and the age of the parchment is:
- τ×n = 5730n = 5730 (2.30) = 13,179 years
- Round to the nearest hundred years: 13,200 years
