- Wed Jul 29, 2009 7:25 pm
- Forum: Trigonometry
- Topic: if x=1/2 and (x+1)(y+1)=2, find rad. meas of arctanx+arctany
- Replies:
**4** - Views:
**3357**

Perhaps you should start by determining the value of y.

- Thu Jul 23, 2009 8:18 pm
- Forum: Pre-Algebra
- Topic: Mixed Numbers with Variables
- Replies:
**2** - Views:
**3007**

As a college math teacher, I would read as a students mistake in representing which would be interpreted as 2/3 TIMES a (i.e. 2/3 is the coefficient on a).

I've never seen variables used in mixed numbers.

I've never seen variables used in mixed numbers.

- Thu Jul 23, 2009 8:15 pm
- Forum: Intermediate Algebra
- Topic: height above trampoline modelled by h = -4.9(t - 1)^2 + 6.3
- Replies:
**3** - Views:
**4042**

Ok...This particular quadratic is written in the form y = a(x-b)^2+c which is just a transformation of the basic y = x^2 quadratic which has a vertex at (0, 0). The two most important transformations for your question are the value of b and c. The b value tells you how far to the right the vertex ha...

- Thu Jul 23, 2009 4:46 am
- Forum: Intermediate Algebra
- Topic: height above trampoline modelled by h = -4.9(t - 1)^2 + 6.3
- Replies:
**3** - Views:
**4042**

This type of function is called a quadratic whose graph is a parabola. The highest(lowest) point of a parabola is called the vertex. Do you know how to find the vertex of a parabola?

- Thu Jul 23, 2009 4:41 am
- Forum: Advanced Algebra ("pre-calculus")
- Topic: Solving Radical Equations
- Replies:
**1** - Views:
**1655**

I don't see any radicals. What I see is:

If you don't know how to insert equations, could you use sqrt(stuff) to indicate ? Thanks!

If you don't know how to insert equations, could you use sqrt(stuff) to indicate ? Thanks!

- Wed Jul 22, 2009 6:26 pm
- Forum: Intermediate Algebra
- Topic: how to work this problem: 3/a²+a × 2a+2/6
- Replies:
**5** - Views:
**2183**

Still a little vague. As written you could mean: \frac{3}{a^2} + (a)\left(\frac{2a+2}{6}\right) or \frac{3}{a^2+a}\left(\frac{2a+2}{6}\right) or what Stapel_eliz wrote or three or four other possibilities (English is tricky, ain't it?). So, use grouping symbols like parentheses: "3 is over (a square...

- Wed Jul 22, 2009 2:31 pm
- Forum: Calculus
- Topic: Determine eqn of conic, given F(3,1), directrix x-1=>0, ecc.
- Replies:
**9** - Views:
**6396**

Yes. You need the center and the value of a and b.

- Wed Jul 22, 2009 2:31 am
- Forum: Beginning Algebra
- Topic: Beginning and Intermediate algebra
- Replies:
**6** - Views:
**7464**

We're home schooling, too. My oldest is only six though, so we're a bit behind you in the curriculum! I haven't looked at the Lial books since 2001 when I came to RIT, so I don't know about the current texts. At the time, the only thing in BEG that wasn't in INT was the introductory chapters: basic ...

- Wed Jul 22, 2009 2:25 am
- Forum: Calculus
- Topic: Determine eqn of conic, given F(3,1), directrix x-1=>0, ecc.
- Replies:
**9** - Views:
**6396**

I thought the directrix was a line. So I assumed it was the line x-1=0 which implies x = 1. That is, a vertical line. If this is the case, then the center of the ellipse can't be at (1,1).

Am I misunderstanding something?

Am I misunderstanding something?

- Tue Jul 21, 2009 2:06 pm
- Forum: Calculus
- Topic: Determine eqn of conic, given F(3,1), directrix x-1=>0, ecc.
- Replies:
**9** - Views:
**6396**

I see how you got a=2 and c = sqrt(2). Then, the length of the major axis would certainly be 4. How did you translate this information into your equation? What steps did you follow?