Half-life = time in which half of material is lost
1/4 = 1/2 x 1/2 so 2 half lives have gone by if only 1/4 of it is left.
age of rock = 2 x half life = 2x1.3 = 2.6 billion years.
Start by limiting both usages you never want to just stop it takes time to get accustomed
Answer:
110 Cal
Explanation:
90 Cal from fats and 20 from carbohydrates
Propane is a gas. The atoms diffuse throughout the house.
