2,208 Answered Questions for the topic Pre Calculus

Pre Calculus

11/03/14

for the given functions f and g, find the requested function and state its domain. f(x) = 4x-3; g(x) = 8x-9
i need some help please
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Pre Calculus

11/02/14

word problem
proof that for any real number k, (x-k) is not a factor of x^4+x^2+1
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Pre Calculus

10/31/14

Finding logarithms
log23+log2x=log25+log2(x-2)
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Pre Calculus

10/31/14

log(3x+5)=2
Solve the logarithmic equation for x.
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Pre Calculus

10/27/14

How many sacks of oats are needed to feed n horses?
If it takes m sacks of oats to feed h horses.   A. h/mn B. mn/h C. hn/m D. hm/n E. hmn
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Pre Calculus

10/12/14

If I have an 11 cup container and a 7 cup container with no marking and free water supply how do I get 2 cups in one container
How do I end up with 2 cups in one container without measurements
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Pre Calculus

10/09/14

-2 exponent
How do I solve an expression with a -2 exponent? Ex: (3y^-6x^2/4y^-7)^-2
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Pre Calculus

10/06/14

Find the number of cars that should use the car wash and the cost per hour for this number.
The cost per hour of running a car wash is C(x)=0.04x2 - 0.74x +5.75, where C(x) is the cost per hour in dollars and x is the number of cars passing through the car wash per hour. Determine the... more
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Pre Calculus

10/06/14

Find the maximum revenue.
The demand function for a new product is p(x)=-7x+65, where p is the prices in dollars and x is the number of items sold in thousands. The cost function is c(x)=9x+105. Determine the maximum revenue.
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Pre Calculus

10/06/14

If the population 10 years ago was 25,000, what is the population today?
The population of a alien city, found on the dark side of the moon has grown at a rate of 3.2% each year for the last 10 years. If the population 10 years ago was 25,000, what is the population today? more
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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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