Mathematics - 27 October 2007

help please i need help

2007-10-27 11:48:24 · 8 answers · asked by dancemagic95 2

expand and simplify where possible, then determine the degree of the polynomial answer a) (y-4)(y^2+2y+4) b) 4(x+2)(x+6) c)3x(4x-5) d) 2(3x+9)+4(x+5) e) 5y(y-3)-4(y^2+2y+4)

2007-10-27 11:46:23 · 3 answers · asked by mauz a 1

I can not do any of these problems and have been stuck for the past 2 weeks....help please!

2007-10-27 11:46:19 · 9 answers · asked by Tristin B 1

Consider the 74 N weight held by two cables shown. The left hand cable is horizontal.

http://img120.imageshack.us/img120/3038/111if3.jpg

What is the tension in the cable slanted at an angle of 53 degrees. Answer in N

What is the tension in the horizontal cable? Answer in N

2007-10-27 11:40:09 · 2 answers · asked by XzoeyX 2

consecutive positive integers such that the product of the first and fourth is four less than twice the first multiplied by the fourth.

2007-10-27 11:38:13 · 4 answers · asked by Andreas 1

Determine if each of the following relations is an equivalence relation. If
yes, explain your answer and give equivalence classes. If no, explain why.


(i) R1 = {(1, 1), (1, 2), (1, 3), (2, 1), (2, 2), (2, 3) (3, 1), (3, 2), (3, 3), (4, 4), (5, 5) }




(ii) R2 = {(1, 1), (1, 2), (1, 3), (1, 4), (2, 1), (2, 2), (3, 1), (3, 3), (4, 1), (4, 4), (5, 5)}

2007-10-27 11:30:55 · 2 answers · asked by simonkf2002 1

Prove this identitys:
1.sin 8(a)=8*sin(a)*cos(a)*cos(2a)*cos(4a)
2.cos 3(a)=4*cos^3(a)-3*cos(a)

2007-10-27 11:30:01 · 1 answers · asked by Amir B 1

T(x)={ cx^2-2x , if x >/= 2;
{ x^3-cx , if x> 2

2007-10-27 11:26:00 · 1 answers · asked by nickesha t 2

This is the problem I am having a really hard time with. I appreciate everyone's help.

3x^3y^4z^-2 / 6x^-1y^3z^-3

I am also still having a hard time with these:

7. (25x3)^2/3 / (125xy2)^1/3

9. (2s + 5z)2 (s + 3z)2

Divide
10. (2x^3-x^2+3x-1) / (x+2)

Please help me. I am in an on-line school and I have just a couple of weeks left with this class. I barely use math (which is why I am bad) and this is my last math class. Please help!!!!!

2007-10-27 11:23:17 · 2 answers · asked by Hope P 1

2007-10-27 11:15:27 · 4 answers · asked by Ronny A 1

the x is a superscript to the 4 and the 2 is a superscript to the x =
2 with a x superscript,
thanks if you can help me.

2007-10-27 11:08:28 · 4 answers · asked by Boo Radley 4

i need major help. heres the question...

Flying east between 2 cities, a plane speed is 380 miles/hr. On the return trip it flies at 420 miles/hr. Find the average speed for the round trip.

This is the problem. I know the answers not 400.

Can someone plz help me. And if its not too much, explain how u got ur answer. Thanks.

2007-10-27 10:58:19 · 4 answers · asked by qwertx722 2

For example:
the order of 5+<4> in the factor group Z(sub 12)/<4>
or (2,1)+<(1,1)> in (Z(sub3)xZ(sub6))/<(1,1)>

2007-10-27 10:51:26 · 3 answers · asked by Anonymous

1. What percent of 65 is 40?
2. What number is 8% of 250?
3. What is 120% of 50?
4. What percent of 50 is 112?

Thank you in advance. (:

2007-10-27 10:39:13 · 7 answers · asked by Brooke 2

This question has bugged me for awhile. Find area inside the loop of the following limacon r= 5-10sin(theta). Please do not come up with 222.031538. I try and it's not correct. Anyone?

2007-10-27 10:37:30 · 1 answers · asked by V for V 2

Can someone PLEASE give me, Step-by-step instructions on multiplying fractions?

1/5 x 20/1

I can't do it =(


AND/OR


How to convert a mixed numeral into an improper fraction?

Step-by-step please =)

8 3/7


Oh and please tell me which is which so I don't get confused. Thanks

2007-10-27 10:37:26 · 13 answers · asked by Anonymous

f(x) = square root of [(8x^2 +1)/ (9-5x^2)]


I am so confused and I have a test on monday please help..

2007-10-27 10:32:55 · 2 answers · asked by Slava T 1

What is the weight of a column of water 7 ft high with a radius of 1.1m?
The density of the water is 1000 kg/m/m/m
Answer in units of N.


Volume = pi * r^2 * h
7 ft = 2.1336 m
Weight = Volume * Density


Volume = 3.14 * 1.1^2 * 2.1336 = 8.1064 m^3
Weight = 8.1064 m^3 * 1000 kg/m^3
Weight = 8106.39984 kg
1 Newton = kg * m/s2

i'm stuck here

2007-10-27 10:30:21 · 4 answers · asked by XzoeyX 2

Find dy/dx if:
y = (sec^2)(sqrtsin2x)

^2 : squared
sqrt: square root

2007-10-27 10:23:45 · 2 answers · asked by hllhnk 1

Hey its raining right now and I am really bored... so sometimes when I am bored I like to do math problems. So here is one for everyone. Wanring this math problem is very easy! If a show starts at 7:20 and lasts 1:40 mintues what time will it be over at? Lol.

2007-10-27 10:15:18 · 6 answers · asked by Anonymous

Find the coordinates of it's reflection accross the x-axis, the y-axis, and the origin.

(-8/9, sqrt(17)/9)

2007-10-27 10:14:23 · 3 answers · asked by Epic M 1

hey, i think i have the answer to this question. i just want to be sure.

it says to simplify
(2h-6)^3

thanks!

2007-10-27 10:11:34 · 4 answers · asked by Anonymous

Given that f(x)= 2x^2+3x-20/ x+4 , find the value(s) of the "x" causing f(x) to be discontinuous and the limit of f(x) as X approaches these value(s)


thanks guys for your help!

2007-10-27 10:03:34 · 4 answers · asked by jasmine 2

I'm a grade nine student in an advanced math program, working at (I think) a grade 10 academic level. We're doing radicals and exponents, and I understand the basics of both, I just have troubles with harder questions. For example:
SIMPLIFY
4*(square root of 2)*([square root of 2]+[square root of 18])
According to my teacher and the answers in the back of my math textbook the answer to this question is 32? Could anybody explain this and just give me any help you can on exponents and radicals in general? And PLEASE don't use really confusing words, or terms, or anything - I just started this unit and I'm really lost, fancy mathematical terminology really won't help.

2007-10-27 09:54:43 · 6 answers · asked by ? 3

okay, so the function is f(x) = 3x^2 - 5x + k

a) write down f '(x)

The equation of the tangent to the graph of * f * at x=p is y=7x-9. Find the value of:

b) p

c) k

2007-10-27 09:49:34 · 2 answers · asked by Anonymous

2007-10-27 09:45:41 · 3 answers · asked by Anonymous

Am I right for the followings?

1) The area of a triangle is 384 square feet. If its base is 8 feet longer than its altitude, find the length of the base and the altitude.

For this one I got: Length= 29, Altitude= 21.

2) Find two consecutive even integers, whose product is 1224.

For this one I got: x = 34 and 36, -34 and -36.

3) One number is 9 less than the other. Find the two numbers if their product is 736.

For this one I got: x = 23, -32

4) 3x - 6 = 0

For this one I got: x = 3, 2

5) | 3x - 6 | = 0

For this one I got: x = 2, -2

6) | 3x - 6 | > 0

For this one I got: x > 2 or x < -2


Thank you so much. I appreciate it.

2007-10-27 09:41:05 · 5 answers · asked by Anonymous

Proportions, 2 step equations and more

2007-10-27 09:40:23 · 5 answers · asked by Sami:) 1

Two cars start off at the same point on a straight highway facing opposite directions. Each car drives for 6 miles, takes a left turn, and drives for 8 miles. How far apart are the two cars?

2 miles
11 miles
14 miles
20 miles
26 miles

Do you know the answer? I've been working on it since forever! If you do know the answer, can you share? And please include a rough explanation. Not a long one. Many thanks.

2007-10-27 09:27:45 · 11 answers · asked by XbabynovaX 5

above the ground by pulling on a rope weighting 6lb/ft. Set up the integral of how much work is required ( only the integrand)? Let x denote the height above ground.

What is the total work?

2007-10-27 09:23:07 · 2 answers · asked by simonkf2002 1