# Math

posted by .

Need help understanding half-life/decay problem for upcoming test.

A water filter is constructed to form a foam that removes 25% of the particulate impurities for each inch of foam.

1.What percentage of the particulate impurities will be removed by a filter consisting of two inches of?
2. How many inches of foam are needed for the filter to remove 50% of the particulate impurities.

Can you explain in either the A=Pa^x or A=Pe^-rx form?

I just mainly need help on setting up the problem.

Thank You Very Much.

• Math -

Please ignore this question. I was a able to get it.

## Similar Questions

1. ### Environmental Science

#33. In two or three well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens. my answer: There are many steps to how water is treated …
2. ### Environmental Science

#33. In two or three well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens. my answer: There are many steps to how water is treated …
3. ### Science

We made t-pentyl Chloride in Lab today using HCl and t-pentyl alcohol. I know t-pentyl chloride is not soluble in water, but I'm still not sure the answer to some of my post lab questions. I've answered a few, but I have 3 that still …
4. ### Pre-Calculus

10. Suppose the cost C of removing p% of the impurities from the waste water in a manufacturing process is given by a) Where does the graph of this function have a vertical asymptote?
5. ### floral design

Which one of the following statements about standard foam is true?
6. ### physics

A foam plastic ( sg = 0.58 ) is to be used as a life preserver. What volume of plastic must be used if it is to keep 20 % (by volume) of a 75 kg man above water in a lake?
7. ### Chem !!!!!!!!!!!!!!!!

All I know is that the colored impurities are soluble in water as sodium salts. so what type of compound does this suggest these impurities are?
8. ### Mechanical Behavior of Materials

A helmet has an open cell polystyrene foam liner that is designed to absorb the kinetic energy from an impact. The foam has a relative density of 10% and the Young's modulus of the solid polystyrene that the foam is made from is 1.5GPa. …
9. ### math

Jerry is packing cylindrical cans with diameter 6 in. and height 10 in. tightly into a box that measures 3 ft by 2 ft by 1 ft. All rows must contain the same number of cans. The cans can touch each other. He then fills all the empty …
10. ### Mechanics

A helmet has an open cell polystyrene foam liner that is designed to absorb the kinetic energy from an impact. The foam has a relative density of 10% and the Young's modulus of the solid polystyrene that the foam is made from is 1.5GPa. …

More Similar Questions

Post a New Question