The number of grams A of a certain radioactive substance present at time t is given by the formula A = 25e^-0.00032t, where t is the number of years from the present. How many
grams are present initially? How many grams are present after 1000 years? What is the
half-life of this substance?

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?