2,198 Answered Questions for the topic Pre Calculus

Pre Calculus Algebra 2

10/04/14

Find the amount of phosphorus-32 remaining after 84 days.
Phosphorus-32 is used to study  plants use of fertilizer \, It has a half-life of 14.3 days. write the exponential decay function of  a 50-mg sample. Find the amount of phosphorus-32 remaining... more
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Pre Calculus

10/04/14

Find the product of the complex number and its conjugate.
1. 2- 3i   2. -3 + 4i   3. -1 - √2i
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Pre Calculus

10/04/14

Use your rules to determine the number of bacteria after 2 hours.
The bacteria E. coli often causes illness amound people who eat the infected food. suppose a single E. coli bacterium in a batch of ground beef begins doubling every 10 minutes. Use your rules to... more
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Pre Calculus

09/29/14

How many pounds of type A coffee were used?
Lamar's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Lamar $5.65 per pound, and type B coffee costs $4.25 per pound. This month's blend used three times... more
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Pre Calculus

09/15/14

Find all real solutions of the equation. Find exact solutions when possible, approximate solutions otherwise
The square root of 3y+1-1= the square root of y+4 
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Pre Calculus

09/14/14

I'm a senior in high school studying pre calculus and I'm trying to solve a compound linear inequality
5-3x>7x-3 Please try to show as much work as possible cause I really am trying to understand! 
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Pre Calculus

09/09/14

application of equations
A merchant has 5 pounds of mixed nuts that cost $30. he wants to add peanuts that cost $1.50 per pound and cashews that cost $4.50 per pound to obtain 50 pounds of a mixture that costs $2.90 per... more
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Pre Calculus

09/04/14

how do i find the interval notation, set notation of 5x - 12 is less than or equal to 3?
i have learned this previously but need a reminder.
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Pre Calculus

08/20/14

4/(x+1)-3/(x+2)=1
the directions are to solve the rational equation
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08/16/14

Find the standard form of the equation of the parabola with a focus at (5, 0) and a directrix at x = -5.
I dont understand how to solve it. please explain the steps 
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06/26/14

perpendicular to 3x+4y=13 and through (2,7)
Summer Math packet question. write the equation in slope intercept and standard form
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Pre Calculus

04/21/14

8(3^((-4)x)=40
Solve the fallowing equations.  8(3-4x)=40
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Pre Calculus

04/07/14

law of exponential growth, y=ae bt where t is measured in days. If the population is 100 when t=0, and 300 when t=4. Find a and b.
In a research experiment, a population of fruit flies is increasing according to the law of exponential growth, y=ae bt where t is measured in days. If the population is 100 when t=0, and 300 when... more
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Pre Calculus

03/31/14

Composition of Functions
Let f(x)=3x^2, g(x)=9x-2, m(x)=4x, and r(x)=sqrt3x. Find and simplify the composite function. 1) r(g(x))----> I got sqrt(27x-6) 2) r(f(x))-----> I got 3x 3) g(m(f(x)))---> I got... more
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Pre Calculus

03/19/14

condense 2[lnx-ln(x+1)-ln(x-1)]
condensing logarithms  
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03/18/14

Vertical shifts
graph y=logx, y=log(10x), and y=log(100x). how do the graphs compare? use a property of logs to show that the graphs are vertical shifts of one another. 
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Pre Calculus

03/11/14

TEST TOMORROW ! i just need a little help with this because...i was gone the day we learned this ...thanks :)
Sound in decibels is measured by comparing the sound intensity, I, to a benchmark sound Io with intensity 10-16 watts/cm2, then noise level in decibels = 10log(I/Io) 1) the noise level of a... more
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Pre Calculus

03/11/14

Doubling time
A population doubles in size every 15 years. Assuming exponential growth, find the annual growth rate. 
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Pre Calculus

03/11/14

annual compound interest rate equivalent to continuous compound
what annual interest rate compounded annually is equivalent to an annual rate of 6% compounded continuously?
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Pre Calculus

03/06/14

These logarithms and exponential models are a bit confusing.. could you please help me fihure these out so i knos how to do the rest ? thank you :)
Give the starting value a, the growth rate r, and the continuous growth rate k. 1) Q=5*2t/8 2) Q=40e(t-5)/12 3) Q=2-(t-5)/3
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Pre Calculus

03/05/14

I'm a bit confused on how to find these
1) e^2x + e^2x =1 2) 2e^3x + e^3x=b---solve for x 3)e^-3lnt 4) 10^2+logx 5) e^7x = 5e^3x    
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Pre Calculus Unit Circle

02/26/14

please please check my answers
18)Evaluate the sine cosine and tangent of the real number  t=(4)(3.14)/3   My answer Sin(t)=4/3 Cos(t)=3/4 Tan(t)=2/3   54)use a calculator to evaluate the expression.Round to the nearest... more
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Pre Calculus

02/25/14

e^2x=4e^x+5
solving for x by using logarithms 
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Pre Calculus

02/25/14

lnx+ln(x+1)=1
solving for x 
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Pre Calculus

02/25/14

If f(x) = x2 + 6x + 10, find f(x - 2)
If f(x) = x2 + 6x + 10, find f(x - 2)
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