Mathematics - 12 November 2007

how do i solve for t in this equation.

0 = -4.9t^2 + 24.5t + 68.6

2007-11-12 05:40:31 · 8 answers · asked by Anonymous

Assuming that curvature of ship path is proportional to angle of her rudder,

at what angle must the rudder be turned to follow the path strictly along the line of 45° latitude?

2007-11-12 05:15:01 · 2 answers · asked by Alexander 6

I don't get it. I mean I understand how the X i or j physically works (it's just factoring it basically), but WHY do it in the first place? To confuse me? To make me write more? WHY?!!? OH WHY!!?!?!?

Thnx, I'll pick a best answer TODAY, you silly willies.

2007-11-12 05:12:52 · 2 answers · asked by James J 2

Near the earth's surface every particle experiences a constant acceleration of 32 ft/sec^2 directed toward the center of the earth; if "up" is considered the positive direction, then this is an acceleration of -32ft/sec^2. Consider a rock thrown straight up in the air from the ground. Let's denote time t=0 as the time when the rock reaches 12 feet up in the air at (upward) velocity of 4 feet per second. Fill in the following with numbers that differ from the correct value by no more than .1 units.

The rock left the ground (was thrown up in the air) at time t = ANSWER seconds, with initial velocity of ANSWER feet per second. It will fall back to the ground at time t = ANSWER second after reaching the maximum height of ANSWER feet at time t = ANSWER seconds.

2007-11-12 05:08:21 · 3 answers · asked by james c 1

What is the range for grades in order get an A? a B? a C?

2007-11-12 05:06:37 · 8 answers · asked by α ρℓα¢є ¢αℓℓє∂ мєℓαи¢нσℓу . 6

3) 2x + 3y = 5
5x - 2y = -16


4) 10x + 5y = 2 1/2
7x - 2y = 1/10









Please explain how do solve these plus answers


Thanks :)

2007-11-12 04:58:36 · 7 answers · asked by Anonymous

Is it 5x squared or 6x or 6x squared?

2007-11-12 04:40:00 · 12 answers · asked by Jourdan----x 1

I got that it was symmetrical with respect to y = -x, but I'm pretty sure I'm wrong. Help, please :)

2007-11-12 04:37:38 · 3 answers · asked by winniemazing 2

In an effort to not cheat on my test, I'm not going to post the actual question, but an example that if you solve could help me with the actual one. Don't give me a final answer, just a jump start I suppose. Thanks!

Find the point on the ellipse x^2 - 2xy + 6y^2 = 10 that is closest to the origin.

2007-11-12 04:35:46 · 4 answers · asked by euchred88 1

What is the value of x upon completion of the following statements?
int x,y,z;
x = 12;
y = 13;
z = 14;
if ( (z == 13) || (z > y)) {
x = x+3;
} else {
x = x+4;
}

2007-11-12 04:29:32 · 2 answers · asked by Nick L 1

I just took a surprisingly easy multi test (my school isn't very smart) and I feel unsure about this question (ironically the most straightforward one).

Find the domain and range of e^(x-y).

I am 90% sure I got this right but I am retarded about e so can someone please assure me? Thanks in advance

2007-11-12 04:22:25 · 1 answers · asked by Mr. Chantastic 2

Enemy air force base C is located at equal distance from point O: AO = BO = CO, and has two types of long range bombers deployed:
Type-Ca(aimed to attack base A) has maximum range CA.
Type-Cb(aimed to attack base B) has maximum range CB.
http://i2.tinypic.com/34odp3a.jpg

Areas of surface of the planet covered by each type of bombers are Sa and Sb respectively.

Long range fighters deployed at AFB A have maximum range AB (just sufficient to defend the naval base).

What is area of planet surface S is covered by long range fighters deployed at A?

2007-11-12 04:11:01 · 2 answers · asked by Anonymous

2007-11-12 04:07:09 · 3 answers · asked by bubbly_stubbly 1

I have a program that's 62,110 square feet. I need the formula that will give me what length and width it takes to create that size. Thanks!

2007-11-12 03:59:09 · 8 answers · asked by Matthew B 1

i need help with my technique when i take on questions about this.

take this example:
prove that:

cos 2x / (1-sin 2x) = (1 + tan 2x) / (1-tan 2x)

all i ever do in these questions is start substituting things like
" sin^2 x + cos^2 x " in place of " 1 "

with no real ideas or aims with what i am doing, i just wade in blindly and hope it works.
so can anybody tell me any sort of techniques for dealing with questions like this?
like what's the first thing you always do with a question like this,
r there certain things you make sure to do that always help out?

i am sick of just charging blindly at these questions because i either get lucky and get the answer by what feels like a fluke, or more often i just make a more complicated mess than the original expression i started with.

can anybody help out? does not have to be with that example i gave up there, but whatever suits you.

cheers.

2007-11-12 03:53:10 · 4 answers · asked by fpa06mr 5

2007-11-12 03:50:23 · 1 answers · asked by Anonymous

In each of the four legs of the relay, a dog jump over a hurdles, retrieve a ball from the fly box, and runs back over the hurdles. In the last leg of the relay, the collies start the course 0.3 second before the sheep dog. The collies is running 23.4 feet per second, and the sheep dog running 24 feet per second. The distance from where the dog start to the fly box is 150 ft. Let t represent the time it take the collies to run the last leg . Write an equation to find the number of seconds after which the sheep dog would catch up with the collies.

Help me please, i'm so confused!
This is what i wrote , is it right?

150 * 23.4x = 150 * 24x - 0.3

2007-11-12 03:50:21 · 1 answers · asked by (: 3

I need to see your work to make sure mine is accurate

1. Solve by factoring:
x2 – 13x = -12



2. Solve using the square root property:
2x2 – 35 = 15


3. Solve using the square root property:
(x + 6)2 = 4

4. Solve by completing the square:
x2 + 6x + 1 = 0


5. Solve using the quadratic formula:
x2 – 3x = 7x – 2

6. Solve using the quadratic formula:
x2 – 7x – 1 = -7

2007-11-12 03:42:07 · 4 answers · asked by Maggie L 1

Can someone in plain English without any complicated words explain the meaning of R^2???
I am trying to explain the relationship of r^2 and an equation I had for a parabola. But I dont understand it myself... can someone explain it to me clearly?

2007-11-12 03:41:58 · 3 answers · asked by Nina 3

20% of 480 is ?

2007-11-12 03:17:21 · 4 answers · asked by Anonymous

2007-11-12 03:14:16 · 8 answers · asked by done with this 3

(a)Two fair tetrahectral dice are rolled. if each is numbered 1-4 draw two way table to show all possible outcomes

(b)What is the probability that both dice show the same Number..

(c)What is the probability that the number on one dice is double the number on other

(d) What is the probability that the sum of both numbers are prime..

2007-11-12 02:59:42 · 5 answers · asked by Anonymous

2007-11-12 02:59:40 · 6 answers · asked by cmhcrusader71 1

i need help with my extra credit for advanced math,

thank you


1.) Write a story problem that can be solved using the number sentence:

1/4n=12 ---- thats 0ne fourth times n equals 12


2.) Mike has two dogs. Quincy, the puppy, eats 1/2 of a can of dog food each day. Gillie, the adult dog, eats 1 can of dog food each day. The cans are sold 3 for $2.29, How much will it cost Mike to feed his dogd for 14 days? show your work. You may want to draw pictures to help you solve this task.

---- this was so confusing to me so if you want to try you can


thank you sooo much!!!

2007-11-12 02:58:18 · 3 answers · asked by Anonymous

Having trouble with these...

y^2 + 16y + 55 = 0

x^2 + 26x + 5 = -20

6y^2 + 10y - 3 = 8y

2007-11-12 02:43:35 · 4 answers · asked by otherthanot 1

i have no idea how to do them. could someone please help me with them and explain me how to do it?

a) integral x^15 dx

b) integral 2^x dx

c) integral (t^3 + 2t - 3)dt

d) integral (x - 1)(x + 2)dx

2007-11-12 02:33:28 · 2 answers · asked by Mathema-what?! 1

I have to use the chain rule to obtain the total derivative w.r.t. t

a) f(x,y) = x + y^2 ...when x = t^2 and y = t^3

b) f(x,y) = xlny + ylnx ...when x = t + 1 and y = lnt

any help on this is appreciated.

2007-11-12 02:31:49 · 1 answers · asked by Mathema-what?! 1

what is the total differential of

z = (x - y)/(x + 1)

2007-11-12 02:29:32 · 2 answers · asked by Mathema-what?! 1

2007-11-12 02:26:12 · 1 answers · asked by itjuzfeelbetter 1

2007-11-12 02:17:29 · 6 answers · asked by Anonymous