Mathematics - 13 September 2007

2007-09-13 17:51:27 · 18 answers · asked by mark_s_gonzales 1

June and Jeanne leave at the same moment and travel in opposite directions. June walks at 1.7 miles per hour and Jeanne walks at 2.8 miles per hour. How long must they travel to be 28.8 miles apart?

Please just don't give me the answer I wanna learn so if you can give me a step by step process that would be awesome!

2007-09-13 17:49:38 · 10 answers · asked by Anonymous

i'm trying to find the inverse of (x-1) / 4

and i got it to be (((x/4) +1) -1) which equals to (x/4) / 4 right?

which equals to x?

2007-09-13 16:54:22 · 9 answers · asked by Anonymous

Hi, i was wondering if any of you math-tastic people out there could help me figure out these math problems.

they are part of the chapter called "trig substitution"

1) integral of (dx/[(25-x^2)^(3/2)])
where x=5 sin (thetha)

2) integral of ((25-x^2)^(1/2))/x dx
where x= 5 sin (thetha)

thank you!!

2007-09-13 16:54:08 · 1 answers · asked by she*wished 2

i don't kno how to do percentage problems!!

2007-09-13 16:47:35 · 7 answers · asked by Amy F 1

[ ( 3 / (x-2)) - ( 1 / (x-3)) ] / [ ( 1 / (2-x)) + (2 / (x+3)) ]

I hope it makes sense with the brackets..it looks a little messy. Please help. thanks :)

2007-09-13 16:33:43 · 5 answers · asked by Anonymous

find dy/dx if y=x-(1/2)(x^2+4) tan^-1 (x/2)
omg, this is so hard. this 1 question worth 50 points of the homework. help!!!

2007-09-13 16:26:28 · 6 answers · asked by NOMEGA 1

I just started a proofs course in college and have been doing great so far with direct proofs (if x and y are both even, then x + y is even - simple stuff like that) ...until this last section hit us...I can't seem to do any of the proofs. We just learned what proof by contrapositive was. Here is one I have no idea about...

If ab > 0 and bc < 0, then ax^2 + bx + c =0 has two distinct real roots.

A couple issues arise...first, what is a distinct real root? She never mentioned it. I know real roots, but distinct...does that mean unique? or what?

Next, I cannot say whether or not a,b, or c is negative. All I know is one or more will have to be to fit both hypothesis.

If I should use proof by contrapositive, well..it simply leaves me stuck at the hypothesis ax^2 + bx + c = 0 does not have two distinct real roots. I still have no idea what to do with that knowledge or how to write it out to even get started with something...

2007-09-13 16:21:12 · 2 answers · asked by Anonymous

2007-09-13 16:19:14 · 4 answers · asked by pink_kitties_and_rhinoplasty 2

Thanks so much in advance!!!
1) Find the domain of the function.

F(X) √ 2x-14

2) Find the domain of the given function.

F(X) = x-10 / x^3+9x

2007-09-13 16:16:09 · 3 answers · asked by lifeiscake 3

I have a test tomorrow, and I need serious help and quick! If a graph has a u shaped curve and it's pointing down, what is it? a relation? function? What if it's curved up?

2007-09-13 16:13:28 · 6 answers · asked by Sassafras 1

its been forever since i have done math
i also need to know step by step to the solution
thanks

2007-09-13 16:13:08 · 9 answers · asked by Anonymous

I just switched majors from undeclared to Math around a semester ago, so I'm still in Trigonometry, preparing to take Calculus. So far, I am loving all of the concepts and things I get to do. I took a College Algebra class and fell in love so much that I became a tutor WHILE taking the class.

I have an education class with someone in Calculus and they are too a math major, and she seems to "show off". In my mind she's an idiot because of her extracurricular philosophies.

While I was doing homework earlier after I got off at work (still at work) a girl came up to me and started to lecture me how what I was doing was wrong (I was solving right triangles using the trig) and once I was finished I checked my answer in the BOB and it cleared.

Does anyone else have this kind of problem with math? Or should I tell these people to shove it and let me enjoy math?

2007-09-13 16:07:59 · 6 answers · asked by MrPodpechan 1

I have looked in two math help books and I still can't figure out this equation!

Terry has 3 more quarters than dimes for a total of $3.55. How many quarters does he have?

I know that the answer is 11 quarters (thanks to the back of the book) but try as I might, I can't figure out how to setup the problem. Could someone please help? And if you don't mind, please explain how you decided to set it up so I can learn from it. (Example- "I put 25-x because....and I set it equal to " " for this reason...and so on.) Thank you so much to whomever helps me, because it will cease my increasing frustration.

2007-09-13 15:52:48 · 5 answers · asked by ashley2325 2

either the y-intercept and one point or the x-intercept and one point?

2007-09-13 15:51:43 · 8 answers · asked by tyra s 2

2007-09-13 15:46:56 · 18 answers · asked by Shaddy 1

2007-09-13 15:45:39 · 3 answers · asked by houstonman20042002 1

wat fraction could 0.28 be the decimal for? plz explain :( i dont understand

2007-09-13 15:44:34 · 8 answers · asked by kassy 3

2007-09-13 15:42:36 · 20 answers · asked by Micheal R 1

An electric hoist is being used to lift a piece of equipment. The diameter of the drum on the hoist is 8 inches and the equipment must be raised 1 foot. Find the number of degrees through which the drum must rotate.

2007-09-13 15:37:29 · 1 answers · asked by Anonymous

(x^2-5x+5)^x^2-9x+20=1

2007-09-13 15:32:59 · 6 answers · asked by lattekiwi 1

The running speed is about 10 feet per second.

1) About how many miles will you run in 100 minutes?

2) On Monday and on Tuesday you run at the speed of 25 minutes. On Wednesday you run for 15 minutes. About how many miles have you run in all?

2007-09-13 15:28:46 · 7 answers · asked by Anonymous

2007-09-13 15:28:14 · 2 answers · asked by yeshila 1

I see people put this in their math equations here all the time yet I still can't figure out what that's supposed to stand for...

My guess maybe its 3 to the 3rd power so instead you would write here: 3^3

Just a guess...

2007-09-13 15:25:44 · 8 answers · asked by Anonymous

2007-09-13 15:25:44 · 1 answers · asked by Anonymous

Theres actually 2 .

So #1 -

At a business luncheon, 424 handshakes took place. No two people shook hands with each other more then once. What is hte least number of people in attendance At the luncheon?

#2 -
Find the sum of the whole numbers from 1 to 999.

2007-09-13 15:17:16 · 6 answers · asked by Anonymous

what is the interest on $1200 invested for 2 years in an account that earbs simple interest at a rate if 5 % per year and tell me how to do it also

2007-09-13 15:13:08 · 2 answers · asked by ***Lovin*** 3

basically what does the upsidedownn t mean. I think it has something to do with greater than or less that but i was only guessing.

2007-09-13 15:12:33 · 19 answers · asked by jc7rc4 2

2007-09-13 15:10:10 · 4 answers · asked by athiyav2000 3

Okay, in a computer class we are learning bianary, and how to convert it and stuff.

The teacher says he wants to see some work but that you can use a calculator.

The problem for those of you who do not know is the whole point of the thing is to get the remainders in division.

So is there anyway to get a remainder using a calculator or to calculate it using the decimals?

I have a TI-83 Plus.

Or do I just have to divide it all by hand?

2007-09-13 15:08:43 · 4 answers · asked by Anonymous