259 Answered Questions for the topic Exponential Functions

Exponential Functions

03/11/18

Suppose your​ friend's parents invest $15,000 in an account paying 4 % compounded annually. What will the balance be after 10 ​years? Round to the nearest cent Exponential Functions Domain Range Independent Variables 03/11/18 you buy a new car that costs$25000 the car depreciates at a rate of 11% per year

independent variable domain and range
Exponential Functions Functions From Tables

03/06/18

write a function for this table: (2,20), (3,40), (4,80), (5,160), (6,320).

I know it's exponential but the equation I got (-20(2)^x) doesn't work when plug 3 (and beyond) for x. what am I missing?? Thanks in Advance!!
Exponential Functions

02/28/18

if the population of a town is 1850 was 250 and it increased by 60% every 25 years, what will be the population in the year 2025?

This is an example question I made up. Can you tell me how I would work this out and make a list of steps??? Thanks!
Exponential Functions

02/14/18

A cars initial value is $23000 with a decreasing value of 8% each year. What is the initial value after 3 years A cars initial value of$23000 is decreasing value of 8% each year. At this rate, approximately what will the value of the car be in 3 years?
Exponential Functions

02/13/18

Between what two integers does the square root of 411 lie

√411 two integers between that
Exponential Functions Word Problem Logarithmic Functions

02/11/18

Application of exponential and logarithmic functions

Bacteria growing in a petri dish double every 30 minutes. If the sample has 10 bacteria in the dish initially,(a) write a function to describe the population at time t. Also,(b) find the population... more
Exponential Functions Word Problem Logarithmic Functions

02/11/18

Application of exponential and logarithmic functions

Bacteria growing in a petri dish quadruple every 2 hours. If the sample has 18 bacteria in the dish initially,(a) write a function to describe the population at time t. Also,(b) find the population... more
Exponential Functions

02/07/18

function W(x)=60(5/6)^x , where x is the number of weeks that pass. How many word will the student remember after 3 weeks?

Ms. Klemperer told her English class that each week students tend to forget one sixth of the vocabulary word they learned in the previous week. Suppose a student learns 60 words. The number of the... more
Exponential Functions

02/05/18

x= 0, 1, 2, 3, 4, 5, X represents the number of years. y represents the amount of bacteria. Write an equation in y=a(b)^x form.

What is the y=a(b)^x form of this equation? The amount of bacteria also doubles per each minute. How much bacteria will be present after 20 minutes?
Exponential Functions

02/05/18

y=(1.45)^t/4 What is the rate of change?

Is the rate of change 45%???
Exponential Functions

02/05/18

7=(1/3)^2x-1 What does x equal

Solve for x
Exponential Functions

02/02/18

an exponential function has the form f(x) = ab

an exponential function has the form f(x) = ab2,where
Exponential Functions Math Exponents

01/06/18

What is the units digit of the sum 1+5+5^2+5^3+5^4+...+5^2012+5^2013?

I am not sure how to find the answer to this. A hint said: first, find the sum 1+5 then the sum 1+5+5^2, then the sum 1+5+5^2+5^3. Do you observe a pattern? Describe what happens and why.
Exponential Functions Pre Calculus Exponential Growth Ib Maths

12/12/17

Exponential Growth and Decay

Jose takes medication after t minutes, the concentration of medication left in his bloodstream is given by A(t)=10(0.5)0.014t , where A is in milligrams per liter. 1. Write down A(0) 2. Find the... more
Exponential Functions

12/12/17

initially 5000 bacteria in a sample growing at a rate of 8% per hour, determine when the bacteria count reaches 10,000

I know this is exponential growth animi supposed to use y=Ca^x, I'm having trouble getting a solid answer when I plug into the formula
Exponential Functions

12/04/17

Construct an exponential function in the form f(t) = y0 bt that describes the number of bacteria (in millions) after t hours.

6. A Petri dish containing an estimated 8.3 million bacteria is treated with an antibiotic. After four hours the number of bacteria has declined to an estimated 7.128 million.

11/30/17

Hi I've really been struggling to figure out how to do the last part of this problem

(d) Find the exact value(s) of x such that f(x)=g(x). If there is more than one solution, enter your answers as a comma separated list. And my f(x)=0.75*4^x and my g(x)=8*0.2^x.
Exponential Functions

11/16/17

A population grows by 5.5% each year. By what percentage does it grow each month? (Round your answer to two decimal places.)

I am working with exponential functions. At first i thought i just needed to divide 5.5 by 12 but the answer shows it is incorrect
Exponential Functions

11/07/17

Write a recursive rule for the exponential function y = 25(0.2)^x

Write a recursive rule for the exponential function y=25(0.2)x
Exponential Functions Algebra

10/31/17

P=f(t) gives the size of a population that begins with 28,000 members and grows at a continuous annual rate of 1.26%.

Find a formula for the population, p=f(t)=.......     I can't seem to figure out how to correctly type the formula for the population.
Exponential Functions

10/16/17

an ant population triples ever 6 weeks. How many times greater is population after 40 weeks compared to 8 weeks?

Exponential Functions

10/11/17

The concentration of a drug in the bloodstream is 300 milligrams er milliliter. After t hours the concentration is 75% of the level of the previous hour.

a) find a model for C(t), the concentration of the drug after t hours   b) determine the concentration after 8 hours

10/08/17

Complex number to exponential form

How do you put the complex number  -2+i  into a form of  e^{ix} ?        with i = sqrt(-1)               x= angle between complex number and the real axis
Exponential Functions Domain And Range

09/28/17

domain and range of g(t)= √(16+7^-t)

I know a square root cannot be negative so  16+7^-t >=0 7^-t>=-16   since an exponential function cannot be negative, can i assume that t is all real numbers? how do i find the range?

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