Online Math Exercise

Online Math Exercise

Math Tutoring for the Real World

If you're the parent of a student who is having a difficult time with math, you're familiar with the complaint that equations seem "pointless." Students want to know how solving equations with variables will help them in the real world. Students aren't sure that real people in the real world use math to solve real problems in their daily lives.

Students need to understand that logic used to solve math equations is a skill that will benefit them throughout life. Even in non-math situations, it is often necessary to isolate the unknown factor in a scenario to understand logically how to go about solving a certain problem. Math methodology lays the foundation for good problem-solving skills. In fact, many potential employers will require applicants to take a general math quiz before being hired. This realism makes the subject matter more enjoyable and easy to learn.

Many students who are struggling in their math work need additional tutorial assistance. In fact, hundreds of thousands of children having difficulty with a subject in school are currently being tutored in the United States for a variety of reasons:

· Many students didn't master basic skills which need to be re-taught to them

· Some have a learning disability which poses challenges to the mastery of math and slows down progress in school

· Others have weak organizational skills which result in difficulty with keeping on schedule with studying and completing assignments

· Some students have medical, social, emotional, behavioral and/or family problems which result in their struggling to keep up with their peers

· And still others simply desire to get ahead

Very often, all it takes to improve a student's low math grades is the right approach. Once that happens, it's as if a light comes on: suddenly everything falls into place! Even students who have been performing very poorly in math can finally experience the joy of "getting it."

Where can parents and students go for good quality math tutoring? Many parents find local tutors but rates can be as high as $175 per hour and not always effective.

An October 16th, 2007 Tutoring Report appeared on the NBC Today Show which described the dilemma many parents face in providing affordable quality tutoring.

As part of its overview of available services, the NBC Today Show explained that new internet technology is available to provide effective online tutoring services which enable students to get high quality one-on-one tutoring in the convenience of their own home at affordable prices.

With some online tutoring services, students can receive supplemental materials such as DVDs featuring complete review by expert teachers of the subject they are studying in school and unlimited practice Exercises. In addition, online services may provide students access to new white board technology which enables them to watch the tutor's lesson and talk to them as if they were face to face with the tutors.

The NBC Today Show interviewed the Foley family in Peekskill, New York where Mrs. Foley acknowledged that she could not afford the costs of chain tutoring company services and therefore opted for an online tutoring program which was affordable and also gave her a full 30 day guarantee.

The two Foley daughters who used the program found that their math grades had a dramatic increase after using the online tutoring service and the DVD math reviews. In the interview, one of the Foley teenage girls said that she found the tutoring service easy to use and a really effective service.

Although no one wants their child to struggle, the good news is that solutions are available for math help. Parents should realize that the knowledge and sense of achievement that a tutoring program can bring to the student will pay big dividends for years to come. Not only will it help earn a better grade, but it will also lay a critical foundation for future success, including help with college admissions exams.

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math homework plz help?

it is taken from the book precalculus by
demana waits foley kennedy
chapter 4 section 4.4
page 394
exercise 72
what it sais is:

a signal buoy in chesapeake bay bobs up and down in the height h of its transmitter above sea level
modeled by h = a sin bt + 5
during a small squall its height variesfrom 1ft to 9ft and there are 3.5 sec from one 9ft height to the text. what are the values of the constants a and b,

if you dont know how to actually solve it plz give either

an idea
or if you know a site online where to find answers
thanks
thank you a lot
only a simple correction

(5+a) - (5-a) = 9 - 1 not 9+1
2a = 8 not 10
a = 4 not 5

i think that that does not affect the rest

It took me quite a while before I understood you actually wanted to write "from one 9ft to the next" (not "text")!

Once you realize that the sin() function has a range of [-1, 1], you know that the function a*sin() will have a range of [-a,+a]. So what will the range be for h = a sin(bt) + 5?

The answer is: [5-a, 5+a]

Now it is given that the height varies from 1ft to 9ft, so with that you can find the value for a:
5-a = 1
5+a = 9
Subtract the first equation from the second and you get 2a = 10, or a = 5.

Now the value for b.
The function sin() has a cycle of 2π, meaning that sin(x) = sin(x+2π). So if after a certain time h is again the same (from 9ft to 9ft), it means the argument of the sine has become 2π greater. Lets say our stopwatch starts when the bouy hits 9ft the first time (stopwatch reads 0 s), and we stop it when it is there the second time (and it reads 3.5 s). Then we have the following equations:
b*t - b*0 = 2π, or bt = 2π
t - 0 = 3.5, so t = 3.5
So b = 2π/3.5

NB: it is not clear from the question if the argument of the sine is expressed in radians or grades. I assumed the first, but if it is the second, then you must replace 2π with 360 in the above equations.

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