# precalculus

1. ### Precalculus Parabola Question

Prove that for a parabola of the form x2 = 4py, for ANY focal chord, lines passing through either endpoint of the focal chord and the vertex will pass through the directrix at the foot of the perpendicular line that can be dropped from the opposite focal chord endpoint to the directrix. Your...
2. ### Conic Sections

Hi guys. So I need help with this problem. This is supposedly a conic 9(x-2)^2 +5(y-2)^2=-36-30y+82 I simplified it and got 9x^2 +5y^2-1=0 This is the form Ax^2 +Cy^2+Dx+Ey+F=0 I'm guessing this is an ellipse, but how do i convert this to the standard ellipse form (x^2/a^2+y^2/b^2=1) If...
3. ### Function story problem

In March 2001 a study indicated that the number of autism cases in the study population increased from 44 cases per 100,000 live births in 1980 to 208 cases per 100,000 live births in 1994. Over the same time period, the percentage of children receiving MMR immunizations by the age of 24 months...
4. ### Shown working but help appreciated! Complex algebra.

BACKGROUND INFORMATION: A researcher is interested in the buying behaviour (an indicator of demand) of a selected group of party pill users. In a controlled experiment, a new legalised party pill is put on to the market. Based on previous data, the researcher suggests the following demand model...
5. ### Prove that acceleration is constant

Hello, Finding my self very frustrated while working on my calculus homework... seeing if someone can help me through where i am getting stuck! Question : An object moves so that its velocity, v, is related to its position, s, according to the function v=sqrt(b^2+2gs) where b and g are...
6. ### I need help on re-writing a Pre-Calculus exam I failed

Basically, I am in Pre-Calculus in college and my first exam I failed miserably. I received an 18% on it and I have very little understanding of anything going on in the course. I should also mention the entire class failed the first exam, so he is having us take the exam home, rewrite the...
7. ### Finding the are of a Parallelogram with coordinates...? Pre-Calculus

(Don't read yet) Finding the are of a Parallelogram with coordinates...? Pre-Calculus Hello. Pre-cal practice work for test tomorrow. Problem gives us these coordinates: A(1,2), B(5,2), C(3,6), D(5, -3) I graphed it. How are we supposed to find the area with these coordinates? I know the...
8. ### Pre-Calculus "problem solving" problem. Stuck

Pre-Calculus "problem solving" problem. (Solved-THANK YOU) A large room contains twospeakers that are 3 meters apart. The sound intensity of one speaker is twice that of the other, as shown in the figure. (To print an enlarged copy of thegraph, select the MathGraph button.) Suppose the listener...
9. ### This is a problem with trig involved and pi

The problem is cos(-π/4+401π) is equal to (blank), if you don't understand, cos(-pi/4+401pi). I think the first step is cos(-π/4+(2x200)π+1)
10. ### Really difficult linear optimization problem from my book

Here is the link to the problem http://i.imgur.com/3MDmG.jpg I really appreciate any help on this problem.
11. ### How to find the horizontal distance in this quadratic formula?

"An archer's arrow follows a parabolic path. The height of the arrow, f(x) in feet, can be modeled by: f(x) = -0.005x^2 +2x +5 , where x is the arrow's horizontal distance in feet." I've done the quadratic formula and the result didn't seem reasonable.. Is there a specific formula for...
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