Mathematics - 26 November 2007

In triangle ABC, suppose that angle C is twice angle A. Show that

ab = c² - a²

A, B, and C are the angles and a, b, and c are the lengths of the corresponding sides.

2007-11-26 11:35:36 · 2 answers · asked by Northstar 7

can someone explain to me how to do these

19-20
consider a 627 N weight held by two cables. the left-handed cable had tension T2 and makes an angle of 48degrees with the ceiling . the right and cable had tension T1 and makes an angle of 35degrees with the ceiling
what is the tension in each cable

10 11
gravity on the surface of the moon is only 1/6 as strong as gravity on earth
the acceleration of gravity is 10m/s^2
what is the weight of a 14kg object on earth (answer in newtons)
weight on moon?

*i thought it would just be 14 times 9.8 for the weight on eearth but i enterd both 137.2 and 137.3 and the computer said it was the wrong answer?

thansk for ur help:)

2007-11-26 11:18:20 · 3 answers · asked by a.h. 2

Evaluate (int 4/1) {x * sqrtx (x-1) dx}


If anyone can help with this question that's great...
I'm using the (int) f(x) dx = F(4) - F(1).

2007-11-26 11:13:42 · 2 answers · asked by KERRY K 1

Can someone explain how to write squares as a trinomial like:

(7u-3)squared

and...

How to decide whether each trinomial is a perfect square.
(If it is, factor it):

64usquared + 72uv + 81vsquared

CAN SOMEONE PLEASE EXPLAIN AS SIMPLE AS POSSIBLE!

Thanks!

2007-11-26 11:08:15 · 2 answers · asked by wavves 4

Can anybody do this? http://uk.geocities.com/stweedle_uk/help.txt
And explain the working out so i can help him with the rest.

Thanks in advance

2007-11-26 11:03:28 · 16 answers · asked by stweedle_uk 4

Write the equation of an ellipse with foci at (-4, 0) and (-4, -6) and major axis of 10

2007-11-26 11:01:15 · 1 answers · asked by confusedkid 3

Who can help me answer this>?

2007-11-26 11:01:01 · 1 answers · asked by Jellybelly 1

James school has 1000 students and 1000 lockers. The first student opens every locker. The second closes every second locker. The third studentreverses ( closes if opened, opens if closed )every third locker. The forth students reversesevery fourth locker... this continues until every student has opened or closed at least one locker. Which lockers are left open after all of this the process? PLEASE EXPLAIN AND I AM IN 7th GRADE THANK YOU VERY MUCH :)

2007-11-26 10:59:11 · 2 answers · asked by Q-Pac 1

2007-11-26 10:55:58 · 22 answers · asked by Anonymous

For any triangle ABC, show that

sin(A - B)/sin(A + B) = (a² - b²)/c²

2007-11-26 10:53:29 · 3 answers · asked by Northstar 7

math of course....wat r those 2 fractions simplified down as?

2007-11-26 10:51:49 · 8 answers · asked by Anonymous

Please help me solve this problem, I have no idea how to start it.

A rock thrown vertically upward from the surface of the moon at a velocity of 24 lm/sec reaches a height of s= 24t - 0.8t² meters in t seconds.

a) Find the rock's veloctiy and acceleration (the acceleration in this case is the acceleration of gravity on the moon.)

b) How long did it take the rock to reach it's highest point?

c) How high did the rock go?

d) How long did it take the rock to reach half of its maximum height?

e) How long was the rock aloft?

If you could show your steps and explain what you are doing it would help alot. Thanks for your help!

2007-11-26 10:50:01 · 1 answers · asked by harmony8423 1

2007-11-26 10:48:55 · 5 answers · asked by emmert j 1

I found this riddle at a high IQ society I belong to and have yet to see anyone break it - I figured it out, can you? Do you think you're smart enough to break the code? It's actually quite simple, so I'm hoping a population with limited knowledge of ciphers will be able to break this quickly.


Can you find the hidden message? The two words are represented below by the numbers where each number represents a letter...here's a clue: My first and last are in CUBES.

21 4 19 27 10 / 14 25 18 40 42

First person to provide me the correct response AND the logic behind the cipher will win 10 points.

Come on Yahoo Answers, show me what you got.

2007-11-26 10:39:05 · 3 answers · asked by CubeScience 3

The ages of the three children in the Suvari family are prime numbers. The oldest is 10 years older than the youngest. Altogether, their ages toatl 35 years. How old are the three Suvari children?

Could you please when you give the answer to show me how you got the answer.

2007-11-26 10:30:29 · 4 answers · asked by Successor 5

math

2007-11-26 10:25:46 · 6 answers · asked by Anonymous

If there is a 6% sales tax on a sweatshirt that costs $22.00, what will be the total cost of the sweatshirt?

2007-11-26 10:22:54 · 33 answers · asked by Anonymous

A farmer grows 252 kilograms of apples. He sells them to a grocer who divides them into 5 kilogram and 2 kilogram bags. If the grocer uses the same number of 5 kg. as 2 kg. bags, then how many bags did he use in all?

2007-11-26 10:20:07 · 2 answers · asked by Anonymous

Georgia's bill for dinner was $25.00. She left the waitress a tip of $5.60. What percent of the bill did the waitress recieve in tips?

2007-11-26 10:18:41 · 9 answers · asked by Anonymous

Sorry i just want to be sure!

=D

2007-11-26 10:15:36 · 6 answers · asked by Anonymous

I have two problems that i dont get so can someone tell me what i did wrong? heres my work

7x + 30 = -12x + 30

then

19x + 30 = 30

then

19x = 0

then i dived 19 by zero and got 19...


and for my other problem

8x - 3 = 8x + 13

then

8x= 8x + 16

then

i got 16x= 0


















what am i doing wrong?? PLEASE help ASAP

2007-11-26 10:14:56 · 11 answers · asked by liviy94 3

Could someone please help me with this, I gave my answer to the teacher and did not get one right. I'm still trying to figure it out. if you could help, it would be great, thanks.

Find all the zeros of the function and write the polynomial has a product of linear factors.
1. f(x) = x^3 + 11x^2 + 39x + 29
2. g(x) = x^5 – 8x^4 + 28x^3 – 56x^2 + 64x – 32


Find a polynomial function with integer coefficients that has the given zeros
3. 0, 0, 4, 1 + i

Use the given zero to find all the zeros of the function.
4. x^3 + x^2 + 9x + 9 zero r = 3i

a) use the root or zero feature of a graphing utility to aproximate the zero's of the function accurate to three decimal places
b)determine one of the exact zeros (use synthetic division) and find the exact value of the remaining zeros.
5. f(x) = x^3 + 4x^2 + 14x + 20

2007-11-26 10:05:30 · 4 answers · asked by Anonymous

1) 9x^2+4=0
2) x^2/2=x-2

how do i do these..i knw i have to use the quadratic formula but im not sure wat to do if the is no "b" value..and like in number 2) the x^2 is over the 2....can anyone plz help that wold be great...thanx for any help in advance

2007-11-26 10:01:09 · 12 answers · asked by Desilicious 1

Solve:
6√30 + -4√20 + 9√45 + -6√30

2007-11-26 09:54:12 · 2 answers · asked by Anonymous

this is the question. negitive 6 divided by 3, is it 3 or negative3?

2007-11-26 09:53:49 · 7 answers · asked by Anonymous

(2x - 1)(3x +4) = (6x - 2) (x+2)

x equals positive integers

2007-11-26 09:50:28 · 6 answers · asked by dani m 1

1: Steven has 3 pounds of brand 121 nuts that sell for $2.23 a pound. He also has brand 330 nuts that sell for $1.75 a pound. If he wants a mixture of nuts that sell for $1.93 a pound, how many pounds of brand 330 should he add?






3 pounds
5 pounds
6 pounds
8 pounds


2: Brianna has 2 pounds of brand 176 nuts that sell for $3 a pound. She also has brand 391 nuts that sell for $1.74 a pound. If she wants a mixture of nuts that sell for $2.58 a pound, how many pounds of brand 391 should she add?






2 pounds
1/2 pound
1 pound
3 pounds


3: Mr. Lowe bought some three-cent stamps and some two-cent stamps. The total cost was $8.90. How many stamps of each kind did he buy if the total number was 345 stamps?






200 three-cent and 145 two-cent
175 three-cent and 170 two-cent
145 three-cent and 200 two-cent
150 three-cent and 195 two-cent


4: A bank teller has a package of five-dollar bills and a package of ten-dollar bills. The total value is $1110. How many bills of each denomination has he, if the total number of bills is 142?






80 fives and 62 tens
63 tens and 79 fives
42 tens and 100 fives
80 tens and 62 fives


5: How many pounds of coffee selling for $2.25 a pound should be added to eight pounds of coffee selling for $3.75 a pound to create a blend, which will sell for $3.45 a pound?






1 pound
2 pounds
3 pounds
4 pounds

2007-11-26 09:45:50 · 4 answers · asked by Est.1992 6

This is the word problem:

On the moon, the acceleration due to gravity is 1.6 m/sec^2.

a) If a rock is dropped into a crevasse, how fast will it be going just before it hits bottom 30 sec. later?

b) How far below the point of release is the bottom of the crevasse?

c) If instead of being released from rest, the rock is thrown into the crevasse from the same point with a downward velocity of 4 m/sec, when will it hit the bottom and how fast will it be going?

THANK YOU SO MUCH! :]

2007-11-26 09:42:17 · 3 answers · asked by Anonymous

2007-11-26 09:41:05 · 16 answers · asked by ceyya 1

Identify the independent and dependent quantity in each situation:

1. the amount of money earned babysitting increases with the number of hours spent babysitting

2. The cost of a skating party increaes with the number of people attending the party.

THANK YOUU!

2007-11-26 09:40:43 · 3 answers · asked by Anonymous