479 Answered Questions for the topic Precalculus Homework

Precalculus Homework

11/22/14

When cell phones first began to be used, news announcers excitedly reported that the use of cell phones were growing exponentially.
Did he really understand what that means? Was he correct and how do you know?   Also, how are exponential and logarithmic functions alike and different? 
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Precalculus Homework

11/22/14

Precalc Question! finding one second growth factor?
The voltage across a charged capacitor measured in Volts is given by V(t)=4(2.72)^(-t/2) where t is measured in seconds since the current was removed. What is the 1-second growth factor? When will... more
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Precalculus Homework Precalculus Honors

11/21/14

Determine constant k, so x-4 is a factor of polynomial
Polynomial: 2x^4-7x^3+kx-10
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Precalculus Homework Precalculus Honors

11/20/14

(2Z+6)^2=-16
We have to solve it over the complex field and have it in a+bi form
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Precalculus Homework

11/20/14

The logistic growth function P(t)= 160/ 1 + 9e^-0.165t describes the population of the endangered species of elk "t" years after
a. How many elk were initially introduced into the habitat? b. How many elk are expected after 6 years? What is the limited size of elk population sustained by the habitat?
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Precalculus Homework Precalculus Honors

11/20/14

solve and put back in a+bi form, i^7^777
This is dealing with complex numbers and conjugates.  I'm not sure where to start or how I would out it back in a+bi form.  The question is about i^7^777
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Precalculus Homework Precalculus Pre Calculus

11/20/14

Precalc help
Find identified term of the geometric sequence. 7th term: 8/5, -16/25, 32/125,-64/625,....
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Precalculus Homework

11/20/14

A little confused for this problem, Could use some help
write the first 5 terms of the geometric sequence. Determine common ratio and write the nth term of the sequence as a function n. a1=80, ak+1=-1/2ak         Note: (k+1) and (k) are bases
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Precalculus Homework

11/20/14

Need some help please
Write the first five terms of the geometric sequence.a1=4, r=-1/square root of 2
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Precalculus Homework

11/15/14

Nancy wants to invest $3000 in saving certificates that bear an interest rate of 9.75% per year
Nancy wants to invest $3000 in saving certificates that bear an interest rate of 9.75% per year, compounded semiannually. How long a time period should she choose to save an amount of $4000?
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Precalculus Homework

11/12/14

Solve for the height
A flag pole is situated on top of a building. The angle of elevation from a point on level ground 330 feet from the building to the top of the flag pole is 63". The angle of elevation from the same... more
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Precalculus Homework

10/29/14

8) for the function: f(x) = (x-1)^2 (x-3) (x+1)
Expended version: x^4 - 4x^3 + 2x^2 + 4x - 3   A) use the leading coefficient test to determine the end behaviors.   Degree:  Leading Coefficient:                                             ... more
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Precalculus Homework

10/29/14

7) what is the equation of the function whose vertex is (1,1) and goes through the point (0,3)
(hint: plug constants into vertex form: f(x) =a(x-h)^2 + k)
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Precalculus Homework

10/29/14

for the function in standard form: f(x)= x^2-2x+1
a) what are the coordinates of the vertex of the parabola?  (hint: x= -b / 2a)            B) is the vertex a minimum of a maximun? explain
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Precalculus Homework

10/29/14

Solve each equation by using the quadratic formula
2x^2+11x-51=0
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Precalculus Homework

10/29/14

Solve each equation by factoring
1) (2b-3) (b+2)=0   2) r^2+2r-48=0   3) x^2+7x=8   4) 8a^2 - 24a=0    
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Precalculus Homework Continuous Compounding

10/28/14

A repitred couple has $500,000 in an account that earns 6.8% interest compounded continually.
They withdraw 5% of the amount in the account each year starting next year. a) Write a formula for the amount of money in the account for t years from now b) Write a formula for the amount of... more
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Precalculus Homework

10/28/14

Suppose $3000 is invested at a rate of 7% per year compounded monthly. (Round your answers to the nearest cent.)
Suppose $3000 is invested at a rate of 7% per year compounded monthly. (Round your answers to the nearest cent.)     a.) Find the principal after 6 months.   b.)  Find the principal after 1... more
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Precalculus Homework Functions Interval

10/18/14

For the function, find the intervals where the function is increasing, decreasing, or constant.
The function is: R(x)= (x+2)2 if x<-1 -x if x≥-1 Thanks in advanced.
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Precalculus Homework Precalculus Word Problem Distance

10/18/14

Determine the approximate distance...
Determine the approximate distance between the Earth, with a mass of approximately 6.0x10^24 kg, and an object which has a mass of 6.42x10^22 kg if the gravitational force equals approximately... more
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Precalculus Homework Word Problem Direct Variation

10/18/14

How far did it travel in the first 2 seconds?
The distance that an object falls from rest, when air is negligible, varies directly as the square of the time. A stone dropped from rest travels 400 feet in the first 5 seconds. Thanks in advanced.
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Precalculus Homework Functions

10/18/14

For the function below, determine a. f(x-1) b. f(x+a)-f(x) and c. f(x^2)
The function is 3√x +6(x=4) Thanks in advanced.
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Precalculus Homework Domain And Range

10/18/14

For each relation below, describe the domain and range and determine whether or not the relation is a function.3x-4y=17and x=vy-4
Thanks in advanved :) The second equation is x=√y-4
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Precalculus Homework

09/27/14

Evaluate the radical expression and express the result in the form a + bi.
√-5√-45
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Precalculus Homework Precalculus

09/24/14

Help with solving this equation. Please help!
f(x) = 8^(x+1) Find f(1/3)   Thank you in advance
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