5. the half-life of a certain radioactive material is 78 hours. an initial amount of the material has a mass of 790 kg. write an exponential function that models the decay of this material. find how much radioactive material remains after 18 hours. round your answer to the nearest thousandth.,

Rewrite the following without an exponent. (5/8)-1

You are updating your garage and the only thing left to paint is your garage day. you're only going to paint the slide that faces the street. the garage door is 9 fert 8inches tall and 120 inches wide. you need to know the surface area of the side of the garage door to determine how much paint to buy. the hardware store sells paint by how much covers a square foot. what is the surface area you should report to the hardware store what is the answer

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?