2,208 Answered Questions for the topic Pre Calculus

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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Pre Calculus

02/09/14

How to simplify cot2x/csc2x
The goal is to simplify the trig indentity expression as much as possible using the different fundamentals of identities like reciprocal identities, quotient identities, and pythagorean identities
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Pre Calculus

01/17/14

what are the roots of x in this equation (x + 2)(x - 2)
i have no idea... ive tried everything and cant seem to get it
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Pre Calculus

12/23/13

Without using a calculator, determine the number of real zeros of the function f(x) = x.3 + 4x.2 + x – 6.
how do i determine the number of real zeros of the function 
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Pre Calculus Calculus Trigonometry

10/30/13

Quarter 1 POW #5
Two cars race around a circular track, in opposite directions, at constant rates. They start at the same position and meet every 30 seconds. If they move in the same direction, they meet every 120... more
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Pre Calculus

10/26/13

The Problem is a word problem. A airplane leaves Los Angeles for Denver at a speed of 440 mph. Thirty minutes later a plane going from Denver to Los Angele leav
The Problem is a word problem. A airplane leaves Los Angeles for Denver at a speed of 440 mph. Thirty minutes later a plane going from Denver to Los Angele leaves Denver with is 850 miles away at a... more
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Pre Calculus Trigonometry

10/22/13

lines a(1) and a(2 in two-dimensional space intersect at a point, forming an acute angle A
lines a(1) and a(2 in two-dimensional space intersect at a point, forming an acute angle A. the slope of a(1) is square root of 5 , and cos A= 2/9. What is the slope of a(2)? There are two answers,... more
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Pre Calculus

10/14/13

What is (1/x)/1-1/x
I am getting ready for a quiz, but I can't remember how to simplify this.
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Pre Calculus

10/03/13

Find the vertical and horzontal asymptopes of the rational function: (-2x^2+1)/(2x^3+4x2)
It is a precalculus question
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Pre Calculus

10/02/13

RE: Worksheet 3
funtion is-x^2-4x-5 answer questions below a.Domain(interval notaion) b.Range(interval notation) c.The function is Increasing on the interval(answer in interval notaion)    or the function is... more
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Pre Calculus

09/15/13

Whats the symmetry of ?
Hey guys, thank you in advance for your help, I am trying to see how I get this done. This is what I have to find out, any help on how to do it would be appreciate it. Thank you!   (a) Symmetric... more
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Pre Calculus Calculus Word Problem

09/09/13

there is a single 21-foot vertical palm tree growing in the middle of a large flat desert island.
there is a single 21-foot vertical palm tree growing in the middle of a large flat desert island. On a certain day, the sun will rise at 6:00 AM and set at 6:00 PM. At noon on that day the sun will... more
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Pre Calculus

09/02/13

what is the answer to this n^2 = 4?
n²=4
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Pre Calculus

08/25/13

How can you express an equation as a quotient if there are exponential fractions and variables involved?
the question is    x-1/2- x3/2  and the "objective" is to express as a quotient. is it possible to solve in the exponential fraction form? would the answer be x2/2 which is just x? Or does each... more
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Pre Calculus

08/08/13

find the value of y so that the line through the pair of points have the given slope
(-3,-5) (4,y) m= 3
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Pre Calculus

05/08/13

What is the answer to (y-3)^2/16 - (x+2)^2/9 in hyperbola form with the center, vertices, foci, asymps, and what a,b, and c equal?
Please show work so I will understand I have been stuck on this one problem.
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