Mathematics - 2 September 2007

1.Evaluate: (f(x+h) - f(x))/h and simplify if f(x)= x^2 + 2x

2. Eliminate the parameter and write a rectangular equation for:
x= t^2 +3
y= 2t

2007-09-02 07:06:21 · 3 answers · asked by jehu22293 2

#1.)

Ok. The first one shows an open box with an aerial view. It shows 1 ft as the length of all sides and 6 in. the height. There is no cover. I am asked to find the surface area.

This is what I have, but I am not sure:

Front = 12" x 6" = 72"
Back = (same) 72"
Side= (same) 72"
Side = (same) 72"
Bottom = 12" x 12" = 144"
Sum = 432 in.^2, or 36 ft^2



#2) The next one is a bit more difficult to describe.

There is a shape that looks something like this:



___________
)__________| Height 2 cm
<----3 cm------>

It says that the bottom piece is 3 cm, the height is 2 cm, and then there is a cutout of a half circle there on the left. The base on the right side is a right angle of 90 degrees. I need to find the perimeter.

This is what I have so far:

P = 2(l+w)
P=2(3cm + 17 cm)
P=6cm + 150 cm
P=156 cm

Thanks so much in advance for your help!

2007-09-02 07:02:58 · 4 answers · asked by humble.earthling 2

Please show your work

2007-09-02 07:02:07 · 4 answers · asked by Anonymous

ok...when I do it by hand I got -6...but on my graphing calculator...I got 2.....so is it -6 or 2??..I'm not sure...Thanks!!

2007-09-02 07:01:36 · 7 answers · asked by lalalala (: 3

Fill in the blank: Each point in the plane can be associated with an ordered pair of numbers called the _________ of the point.

2007-09-02 06:59:01 · 1 answers · asked by ehsbigpapi9 1

Complete the given table of values. Identify the x-intercepts, vertex, and the axis of symmetry.
(I don't need an explanation of the graph. I know how to do that. it's the rest of it)

1. y = x^2 + 2x - 3
x y
-2 ?
-1 ?
0 ?
1 ?
2 ?

2. y = x^2 + 1
x y
-2 ?
-1 ?
0 ?
1 ?
2 ?

2007-09-02 06:52:32 · 5 answers · asked by casper5 3

I currently have trigonometry and I need some help so if you answer this question please let it relate to trig. NOT GEOMETRY (many ppl get confused)

How do you find the complement and supplement of an angle?

EX: find(if possible) the complement and supplement of the angle

π /3

&& also how do convert an angle measure to D° M' S" ( && if you can tell me what d,m,s is also that would be lovely!)

EX: convert the angle measure to D° M' S" form

240.6°

(if you don't know how to work out these problems if you can give me a link that will explain in detail how to solve these problems I would be very grateful!!!)

THANK YOU SO MUCH!!!!!

2007-09-02 06:49:01 · 3 answers · asked by First_time_mommy 2

can someone please tell me whats 20% off 58.94

thanks

2007-09-02 06:48:12 · 18 answers · asked by Crystal 1

The number 2.525252525252... can be written as a fraction.

What is the sum of the terms of the fraction?

2007-09-02 06:41:16 · 5 answers · asked by Christine P 5

I have some questions plz tell answers and steps and stuff on how you find out.

4. Find the parametric equations for an ellispse of the form x^2/a^2 +y^2/b^2 = 1.
Tks for help

2007-09-02 06:34:33 · 3 answers · asked by CGAR 2

I already know I can divide, but I have to use substitution. Do I just plug in the x-2 for x? Please HELPPP!!

2007-09-02 06:32:45 · 6 answers · asked by Anonymous

2007-09-02 06:31:43 · 5 answers · asked by Anonymous

1. 1/(x+h) - 1/x

2. 2/(x^2)/10/(x^5)

3. (1/3+x - 1/3)/x

4. square root of x/x

5. e^(1+ln(x))

2007-09-02 06:25:56 · 1 answers · asked by jehu22293 2

keeping it as a mixed number

2007-09-02 06:19:40 · 10 answers · asked by Papi Tony 3

"At first, all the lockers are closed. A person walks by, and opens every other locker, starting from locker 2. Thus lockers 2, 4, 6, ... 998, 1000 are open. Another person walks by, and changes the "state" (open or closed) of every third locker. Another person changes the state of every fourth locker, and so on."

I have figured out the answer to this question - lockers whose numbers are perfect squares will be closed (1, 4, 9, 16, 25, and so on). It's simple once you think about it; the number of factors a number has is how many times its "state" has been changed. If we look at 6, it can be broken into 1 x 6 and 2 x 3. Disregarding 1 (because nobody went around changing all the closed lockers to open), the state has been changed 3 times leaving it open. Now take 25. Breaking it apart into its factors, we get 1 * 25 and 5 * 5. We can't include 5 twice, so there are an even number of state changes leaving it closed.

So I understand this problem, but how can I prove it?

2007-09-02 06:12:50 · 2 answers · asked by Anonymous

2007-09-02 06:06:47 · 10 answers · asked by jd e 1

4 2/7 x 8/11

2007-09-02 06:04:50 · 4 answers · asked by Anonymous

F(x)= (sin2x) / x , x cannot equal zero

k, x=0

In order for f(x) to be continuous at x=0, what must the value of k be?

2007-09-02 06:03:54 · 5 answers · asked by Mike 2

Divide 7/8 divided by 7

2007-09-02 06:03:04 · 5 answers · asked by Anonymous

Consider the parabola y = x^2
a point P(x,y) lies on the parabola

d is the distance between P and (0,1)

express the distance d as a function of the y coordinate of P

2007-09-02 05:59:55 · 4 answers · asked by NKS 2

2007-09-02 05:59:40 · 5 answers · asked by glongword 1

1. A school shirt is available in either long-sleeved or short-sleeved, in sizes small, medium, large, and extra large, and in one of two colors. How many different shirts is there?

2. A clown is shout out of a cannon with an initial upward velocity of 25m/sec^2. Ig h(t)= (16t^2)+25t+4 represents his path, and t represents time in seconds and h(t) represents his height above the ground, when will he reach the highest point of his travels? How high does he get?

2007-09-02 05:59:28 · 2 answers · asked by Anonymous

44 ft/s x 1 mi/5,280 ft x 3,600 s/h

2007-09-02 05:57:51 · 1 answers · asked by x 1

2007-09-02 05:57:22 · 2 answers · asked by nurul farahin j 1

2007-09-02 05:54:13 · 5 answers · asked by roosmom 3

1. Factor (4x+5)^3 + (4x+5)^2

2. Factor 3(x+2)(x-1)+15(x+2)^2(x-1)

3. Factor 2x^3 - 5x^2+10x-25

4. Factor (125x^6)-8

2007-09-02 05:52:13 · 4 answers · asked by Anonymous

The diagram shows there is a right angled triangle OPQ
and a circle with centre C (0,5) and diameter OS
Find the equation of the chord SR
Triangle:
OP = 6
PQ = 3

2007-09-02 05:49:58 · 1 answers · asked by Anonymous

If 4 Pairs Of Jeans Cost £60, How Much Do 6 Pairs Of Jeans Cost?

If 2 Newspapers Cost 60 pence, How Much Do 7 Newspapers Cost?

If 3 Vases Cost £60, How Much Do 5 Vases Cost ?

ThankYew =)
XxxxxxxxxxX

2007-09-02 05:29:51 · 8 answers · asked by Anonymous

Hi! This is in the section of my trigonometry book on trigonometric identities.... specifically the sum and difference formulas for sin and tan functions. Anyway, the directions say to "Write each expression as a function of α alone." I have no idea what that means or how to do it.

Here's a few examples:

sin (α - π)
sin (360° - α)
tan (π/4 + α)
tan (180 + α)

What does that mean and how do you do that to problems like the above? Thank you so much! I'll pick a best answer TODAY!

2007-09-02 05:14:43 · 6 answers · asked by Anonymous

Put all the 1-9 digits on each box, so that the total is 15 from every direction(vertical, horizontal and slope) when summed....

2007-09-02 05:05:37 · 4 answers · asked by Izati S 1