Mathematics - 29 December 2007

Please give me a brief explanation of how you got these answers so I'll be better at in the future. Thanks. :)

1.) Which doesn't represent a possible intersection of a line and a right cone with height 4 cm: 3 points, 2 points, or one point?

2.) Describe the locus of all points in a plane that are 9 cm from M?
circle M with a radius of 18 cm
circle M with a radius of 9 cm
square with 9 cm sides
square with 18 cm sides

3.) Describe the locus of all points that are 3 cm from a point m?

a line, 3 cm from line m
a pair of parallel lines, each parallel to and 3 cm from line m
a sphere with a radius of 3 cm
a circle with a diameter of 6 cm

I really don't get that locus stuff, if someone could explain I'd feel smarter lol. :)

2007-12-29 09:01:06 · 3 answers · asked by BetterCallJesus! 1

2007-12-29 08:59:01 · 4 answers · asked by Anonymous

my did took 2 years of it and he said he hasnt used it since he makes great money over $80,000 a year has a welder,/steel worker

2007-12-29 08:57:36 · 9 answers · asked by kelly S 2

2007-12-29 08:49:54 · 11 answers · asked by raymond c 1

2007-12-29 08:47:53 · 4 answers · asked by ʞzɹәႨnɹ 2

a x=-1
b x=-3
c y=-1
d y=-3

2007-12-29 08:42:45 · 5 answers · asked by Anonymous

The atmospheric pressure p on a balloon or an aircraft decreases with increasing height. This pressure, measured in millimeters of mercury, is related to the height h (in kilometers) above sea level by the formula p = 760e^(-0.145h).

(a) Find the height of an aircraft if the atmospheric pressure is 340 millimeters in mercury.

(b) Find the height of a mountain if the atmospheric pressure is 777 millimeters in mercury.

2007-12-29 08:34:32 · 5 answers · asked by journey 1

Solve each log equation.

(1) log_6 (36) = 5x + 3

(2) e^(-2x) = 1/3

2007-12-29 08:17:52 · 5 answers · asked by journey 1

Simplify: (1/2) (2x - 10) =

A. 2x + 5/2
B. x + 5
C. x - 20
D. x - 5

Name the property that is illustrated: a + (-a) = 0

A. Identity
B. Additive Inverse
C. Reflexive
D. Multiplicative Inverse

Solve: 2a + 1 = 2a - 5

A. a = 7
B. no solution
C. a = 1
D. a = -19/2

Simplify: 1/3(6a - 3)

A. 2a - 1
B. 2a - 19
C. 18a -1
D. 3a + 1

What letter represents the y-intercept in the slope-intercept equation?

A. x
B. y
C. m
D. b

2007-12-29 08:15:16 · 3 answers · asked by Donny 2

Solve each log equation.

(1) Ine^(-2x) = 8

(2) log_5 (626) = x

2007-12-29 08:13:50 · 4 answers · asked by journey 1

Solve each log equation below.

(1) log_5 (x) = 3

(2) log_3 (3x - 2) = 2

2007-12-29 08:11:47 · 6 answers · asked by journey 1

How to find the radius of a circle with radius 10 Cm.



I Drew a circle with center O at P(0,0).
Let dr = a small change in radius.
Define Pi = A/(2R) => A = 2PiR

Integrate from R = 0 to R = R
the curve 2Pi ⌠Rdr
= PiR^2 = Area of the circle


So I know the radius is 10 cm...then the area = Pi*100 = 314 cm^2

That seems a bit complex ...I'm just looking for a simple formula for the radius...


I know that if I take an angle of Pi/4 * R = Arc Length of this segment ....so then I tried splitting the area up into 4 pieces

314 /4 = Pi*R

I'm trying to find R ...but I am stuck

Help????

2007-12-29 08:09:18 · 3 answers · asked by Anonymous

The coordinates of the midpoint of a segment with the endpoints A( 0, 2, 4) and B (-8, 2, -6)?

Please tell me HOW you got he answer also. Thanks :)

2007-12-29 08:03:08 · 3 answers · asked by BetterCallJesus! 1

2007-12-29 07:54:24 · 11 answers · asked by ppd232 1

2007-12-29 07:39:36 · 9 answers · asked by christina 4

2007-12-29 07:36:20 · 7 answers · asked by ppd232 1

a^n + b^n = c^n , n>2

Why can't I just get a computer:

graph [x^3+y^3]^(1/3) = z(x,y)
Then graph [x^4+y^4]^(1/4) =z(x,y)
etc...study how each curve changes as n increases

Generalize for all n...then graph x^y= p(x,y) ...and see geometrically that p never intersects z(x,y) for any integer ...

2007-12-29 07:33:24 · 5 answers · asked by Anonymous

Write the given equation in the form (x-h)^2+(y-k)^2=r^2, give the center and radius of the circle by the equation.
x^2+y^2+4x-12y-9=0

2007-12-29 07:29:27 · 6 answers · asked by :D...hello 1

2007-12-29 07:20:22 · 8 answers · asked by Anonymous

?????

Who is the worst mathematician in the world (Someone who has a Ph.D in math only!) and why?

2007-12-29 07:18:12 · 6 answers · asked by Anonymous

i dont know what the formula is to do fibonaaci sequences so if you could explain that to me i would appreciate it

2007-12-29 07:11:21 · 5 answers · asked by Anonymous

a curve on the xy-plane is defined parametically by the equations x=t^2 +t and y=t^2-t. For what values of t is the tangent to the curve horizontal?

2007-12-29 07:02:23 · 7 answers · asked by Anonymous

I know how to graph the equation, but need help breaking it down so it can be graphed properly.. thanks

2007-12-29 06:55:41 · 2 answers · asked by Sam o 1

if y=x(ln x)^2, then y'=

2007-12-29 06:54:34 · 4 answers · asked by Anonymous

what is the equation of the line tangent to the curve with parametric equations x=3e^-t, y=6e^t at the point where t=0?

2007-12-29 06:53:19 · 2 answers · asked by Anonymous

Find all extrema in the interval [0,2π] if y= x + sin x

2007-12-29 06:50:25 · 1 answers · asked by Anonymous

Find the limit: lim x->∞ 2x^4+6x^2+5/3+x^3

2007-12-29 06:43:39 · 6 answers · asked by Anonymous

2007-12-29 06:41:11 · 7 answers · asked by ppd232 1

9x² + y² = 9
3x - y = 3

2007-12-29 06:17:37 · 5 answers · asked by kayy♥ 3

2007-12-29 06:15:00 · 3 answers · asked by SF134 1