1 Maktilar

Exponential Growth And Decay Homework

Arturo O.

Melbourne, FL

10kg isotope decays to 4kg after 15 years. How much isotope remains after 18 years? (You can leave in exact form)

Last question on an assignment, thanks for the help.

Feb 27 | Ethan from New York, NY | 1 Answer | 0 Votes

Exponential Decay

Greg F.

Santa Monica, CA

Algebra 1- Exponential Growth & Decay

How are exponential growth and decay present in the real world? Give at least 2 examples for exponential growth and 2 examples of exponential decay. My Answer: I have only been able to...

Feb 5 | Alyce from Lithia Springs, GA | 1 Answer | 1 Vote

Exponential GrowthExponential DecayWord ProblemsAlgebra 1

Arturo O.

Melbourne, FL

Decay constant of radioactive isotope

A radioactive isotope decays according to the formula A(t)=Aoe^kt, where t is time in years. The initial amount was 10g and 8g of the isotope remained after 5 years. a) Find the decay constant,...

Nov 5 | Helayna from Shrewsbury, NJ | 1 Answer | 0 Votes

PrecalculusDecayExponential DecayHelp With Homework I Am Stumped Beyond Belief

Michael J.

East Elmhurst, NY

Answer all questions

Select "Growth" or "Decay" to classify each function. Function              Growth      Decay y=200(0.5)^2t y=1/2(2...

Oct 30 | Michael from New Orleans, LA | 1 Answer | 0 Votes

MathExponential DecayExponential Growth

J.R. S.

Carmel, IN

Please help asap

Measuring the amount of carbon-14 enables an archaeologist to determine the age of artifacts and fossils. In 1962, skeletal and fossil remains of a woman were found. The fossil was estimated to be...

Oct 11 | Kristine from Alden, IL | 1 Answer | 0 Votes

PrecalculusExponential Decay

Mark M.

Carson, CA

What is general shape of an exponential decay function? (see below)

I know for growth it is a steeply rising curve and feel like it would be the same for decay just opposite?  So, is it still B. ?   A.  A falling curve that approaches, but never...

Jul 25 | Amy from East Troy, WI | 1 Answer | 0 Votes

Exponential Decay

J.R. S.

Carmel, IN

What percent of the phosphorus-32 decays each day?

The amount y (in grams) of the radioactive isotope phosphorus-32 remaining after t days is y=a(0.5)t/14, where a is the initial amount (in grams). Round the answer to the nearest hundredth of...

Jul 15 | Kelly from Hayward, CA | 1 Answer | 0 Votes

Exponential DecayAlgebra 2

Arturo O.

Melbourne, FL

Find an exponential rule that would model the amount of Tc-99m left in the person at any time t in days.

Tc-99m is used to detect tumors in the body. The half life of Tc-99m is only 6 hours. Suppose an initial dosage of 20 mCi was administered. Find the rule.

May 21 | Gabbie from Glenside, PA | 1 Answer | 0 Votes

Exponential DecayExponential Functions

Mark M.

Carson, CA

my garden and reduces my space, on average, by 5% each year. If the garden started out at 850 sq ft approximately how many sq ft will there be in 12 years

This is talking about approximate doubling time and half-time decrease  

May 3 | Naomi from Greenwood, MO | 1 Answer | 0 Votes

Exponential Decay

Mark M.

Carson, CA

word problem

A certain species of animal is endangered and its numbers are decreasing 11% annually. There are currently 440 animals in the population. Which is an exponential function representing the population...

Apr 28 | Sydney from Orange Park, FL | 1 Answer | 0 Votes

Exponential Decay

Kemal G.

South Bend, IN

f(t)=10/1+e^-.1t

I need to find a formula for f-1(t) do I set the funtion =0 =x or what?

Apr 12 | John from Mentor, OH | 1 Answer | 0 Votes

Exponential DecayExponential And Logarithmic FunctionsNo answers ... yet!

A principal of $2700 is invested at 3% interest, compound annually. How many years will it take to accumulate $4000 or more in the account?

Write the smallest possi whole number answer. 

May 1 | Nicki from Dubuque, IA | 0 Answers | 0 Votes

Exponential And Logarithmic FunctionsExponential GrowthExponential Decay

Kenneth S.

Mesa, AZ

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 

3/9/2017 | Wow from Doylestown, PA | 1 Answer | 0 Votes

Natural LogsNatural Logarithmic And Exponential FunctionsLogarithmic FunctionsLogarithmic EquationNewton's Law Of Cooling

Mark M.

Bayport, NY

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?

11/23/2016 | Star from Beloit, WI | 1 Answer | 1 Vote

LogarithmsExponential Decay

Philip P.

Olney, MD

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...

LogarithmsExponential Decay

Mark M.

Carson, CA

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 percent...

Exponential GrowthExponential DecayRate Of Change

Ira S.

Hendersonville, NC

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 

Exponential GrowthExponential Decay

Mark M.

Carson, CA

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

Exponential GrowthExponential Decay

Issa H.

Monterey Park, CA

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

10/12/2016 | Destiny from Pittsburg, CA | 2 Answers | 0 Votes

Exponential GrowthExponential DecayNo answers ... yet!

In a competition, four schools compete, and the winner advances to the next round. Suppose 256 schools start the competition. Write and exponential function

In a competition , four schools compete, and the winner advances to the next round. Therefore, after each round only .25 schools remain in the competition for the next round. Suppose 256 schools start...

2/20/2017 | Sarah from Nacogdoches, TX | 0 Answers | 0 Votes

Exponential Decay

Unformatted text preview: Answers: Chapter 7 Exponential and Logarithmic Functions Lesson 7-1 Exponential Functions, Growth, and Decay; 7. decay 11. a. f(x)=10(0.95)" Insulin {u nitsl I‘d-b.5100 D a s 12 15 Timeimin] c. = 6 units d. 3.6 min. 17. 5.8 yr 23. (0, 1) 10. 15. 21. 27. b. tan-mi] 5 CI 0 l . C a a Rail freight C: 8 '3 12 2d 35 48 Time since 1950 ler 0. year 24, or 1984 == $12,000,000 a. = 3146 b. 12th month 8. 17%| b. A(t)=500(0.83)’ o. 36.8 mg Answers: Chapter 7 Exponential and Logarithmic Functions Lesson 7-1 Exponential Functions, Growth, and Decay; 36. 38. x 2 7.86 37. x > 22.76 Solutions: Chapter 7’ Exponential and Logarithmic Functions Lesson 7-1 Exponential Functions, Growth, and Decay; —8 9. growth 10a. b. f(t) = 580(1.0232)t _. 0'1 0 G | _; N O O I Rail freight (ton-mi) 4:. O D | | 012 24 Time since 1960 (yr) 36 48 . The number of ton-miles would have exceeded or would exceed 1 trillion in year 24, or 1984. Solutions: Chapter 7’ Exponential and Logarithmic Functions Lesson 7-1 Exponential Functions, Growth, and Decay; 11a. {(x) = 10(035)" b. l 00 an ill 4:. Insulin (units) 1 m | l Time {min} c. About 6 units will remain after 10 minutes. cl. It will take about 13.6 min for half of the dose to remain. 15. 2008 — 1626 = 382 24(1 + 3.5%)382 = 24(1.035)3‘32 = 122293551 The balance in 2008 will be about $12,000,000. 17. Let x be the number of years needed. 2765(1 — 30%)X = 350 2765(07") = 350 0.7" m 0.12658 X m 5.8 It will take about 5.8 years for the computer’s value to be less than $350. 21a. 12000(1 — 20%,)6: 12000(0.8)6 == 3146 The rep sold about 3146 animals in the 6th month after the peak. b. Let X be the number of month that the rep first sold less than 1000 animals. 12000(1 — 20%)" = 1000 12000(0.8") = 1000 0.8" a: 0.0833 X a: '12 The rep first sold less than 1000 animals in the 12th month. 23. (0, 1) Solutions: Chapter 7’ Exponential and Logarithmic Functions Lesson 7-1 Exponential Functions, Growth, and Decay; 78_M_£_ _ _ 0.17 = 17% 500 500 There is a 17% decrease in the amount each day. b. A(t) = 500(1 _ 17%)‘ = 500(033)‘ c. A(14) = 500(0.83)14 2 36.8 About 36.8 mg will remain after 14 days. 2 x 40 10 20 30 38. 3.97 < X< 4.42 ...
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