59 Answered Questions for the topic Exponential Decay

03/09/17

A pie cools in a 70 degree room. The pie is 300 degrees. After ten minuites the pie cools to 260 degrees
Create a formula then find the temp of the pie after 120 minuites 
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02/17/17

Exponential rate of growth/decay?
A study is done on the population of a certain fish species in a lake. Suppose that the population size P(t) after t years is given by the following exponential function. P(t)= 280(0.81)^t. What... more
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Exponential Decay Exponential Growth

02/14/17

Rewrite y=(1.4)^t+8 in the form y=a(1+r)^t
I keep getting the wrong answer.. not sure if it goes to 4%? idk 
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Exponential Decay Exponential Growth

02/14/17

Write a function in terms of t that represents the situation. A company profit of $20,000 decreases by 13.4% each year.
Not sure what the equation equals out to; the base is y=a(1+r/n)^nt
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12/04/16

Half Life of a Substance
Suppose 128 oz of radioactive substance decays to 28 oz in 6 hours, what is the half-life of the substance?
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Exponential Decay Logarithms

11/23/16

An endangered frog species has a population of 10 000.
An endangered frog species has a population of 10 000. Biologist estimate that the stock is decreasing at 3% per year. At this rate, approximately how many years will it take before only 80% of the... more
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Exponential Decay Logarithms

11/23/16

If the half-life of sodium-24 is 3.1 hours, then the time it takes sodium-24 to decay from 148 grams to 5.2 grams is?
If the half-life of sodium-24 is 3.1 hours, then the time it takes sodium-24 to decay from 148 grams to 5.2 grams is?
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Exponential Decay Math Word Problem College Algebra

11/21/16

Create an exponential function of the the form Q= Q_0
The number of restaurants in a city that has a 780 restaurants in 2013 increases at a rate 2.8% per year. (a)Create an exponential function of the the form Q= Q_0 \times (1+r)^t (where r > 0 for... more
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Exponential Decay Exponential Growth

10/12/16

Determine the amount of an investment if $400 is invested at an annual interest rate of 7.25% for 7 years. Round to the nearest penny.
F(x)=a(1+/-R)^t
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Exponential Decay Exponential Growth

09/12/16

y=41(0.6)^x
Given the following exponential function, identify whether the change represents growth or decay, and determine the percentage rate of increase or decrease. y=41(0.6)xIs it growing or decreasing?... more
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Exponential Decay Algebra 2 Regents Common Core

08/16/16

Which function represents exponential decay?
1) 2^0.3t 2) 1.2^3t 3) (1/2)^-t 4) y=5^-t   please explain how it is 4 I would think it was 3
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04/12/16

Exponential Functions
1. Scientists have observed that living matter contains, in addition to carbon, C 12, a fixed Percentage of a radioactive isotope of carbon, C14. When the living material dies, the amount of C12... more
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Exponential Decay

02/04/16

Touch screen is $850. What will the value be in 5 years if it decays at a rate of 35%
Ray Idusties bought a touch screen monitor for $850. The monitor is expected to depreciate at a rate of 35% per year. What will the value of the monitor be in 5 years?
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Exponential Decay

12/09/15

The half-life of radium-226 is 1600 years
(a) What is the exponential decay rate? Round to 5 decimal Places (b) Suppose we have 20 mg sample. How much of the sample will remain after 3000 years? Round to two decimal places
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Exponential Decay Math Word Problems

10/25/15

find the half-life of a radioactive substance that decays by 5% in 7 years.
I don't know what exact formula to use. i know 5% is .05 and 7 years is the Time. I'm not sure how to find the half time in years with the given. 
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10/13/15

You buys a house for $130,000. It appreciates 6% per year. How much is it worth in 10 years?
Exponential growth or decay? Write a function that represents this situation: Initial Amount = ?? Growth\Decay Rate: Percent=?% Decimel=?.? Answer: 
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Exponential Decay

10/07/15

decay type of question
under certain water conditions, the free chlorine in a swimming pool decomposes according to the law of uninhibited decay. after shocking his pool, Ben tested the water and found that the free... more
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08/23/15

Decay Factor Form Maths
For my maths assignment, i had to do an experiment using a pendulum and measuring the amplitude of every 10 swings up to the 80th swing. One of the questions is find the ratio between consecutive... more
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Exponential Decay

06/10/15

If a sample of 120 grams decays to only 85 grams after 6 days, how many grams of Mathonite will remain after 12 days?
Problem about exponential decay.
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05/05/15

It is an exponential decline question
The sales, S, of a product have declined in recent years. 1.8 million were sold in 2009 but only 1.2 million sold in 2012. Assume the sales are decreasing according to the exponential model... more
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Exponential Decay

05/03/15

: atmospheric pressure decreases by about 12% for every 1000 meters you climb. the pressure at sea level is about 1013 millibar
A. construct a model to represent the atmospheric pressure at a given altitude in thousands of meters? B. How many atmospheres of pressure will you feel at 5,895 meters? (Top of Mt.... more
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Exponential Decay Word Problem College Algebra

04/28/15

carbon 14 is used for carbon dating.
Carbon 14 is used for carbon dating. Carbon 14 decays at a rate of y=Yoe-(ln2)(1/5700)t. If a mummy is found and has exactly 1/3 of its carbon 14 remaining, how long has the mummy been entombed.
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Exponential Decay Algebra 1 Algebra College Algebra

04/24/15

A population grows exponentially at an annual rate given by r=0.03. What will the population be in 75 years if the initial population is 2500?
A population grows exponentially at an annual rate given by r=0.03. What will the population be in 75 years if the initial population is 2500?
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Exponential Decay

04/19/15

f(x)=12.57/1+4.11e^-0.026x when will the world population be 7 billion
I need use this formula to find when the population will reach 7 billion  
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Exponential Decay

04/06/15

decay - check exponential model is correct
half life of m-50 is 8 hrs, and you have 50 grams.  "A" is number of hrs after recording and f(A) is the amt left. describe this with an exponential model.     I have:  50 * 1/2 ^a/8 is this... more
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