Mathematics - 16 November 2007

I'm not good AT ALL with word problems. Writing them as equations and all. Anyway, if you could just show me how to write these following word problems as Quadratic Equations, I can finish them myself. Solve them that is. Here are the questions.


Model each problem with a quadratic equation. Then Solve.

17. Find the length of the side of a square with an area of six hundred and twenty five feet squared. (625 ft^2)

18. Find the radius of a circle with an area of one hundred and fifty three, point eight six feet squared. (153.86 ft^2)

Thanks for any help you can offer!

2007-11-16 08:23:37 · 5 answers · asked by Anonymous

solve 2+Logbase2[x+2]= Logbase2[x]+ Logbase2[x-3]

2007-11-16 08:16:58 · 2 answers · asked by Anonymous

what is 485 divided by 16? I need the correct answer and if I dont, I wont pass. So PLEASE I need it right. and PLEASE show work.

2007-11-16 08:12:37 · 3 answers · asked by Anonymous

2007-11-16 08:12:06 · 2 answers · asked by Anonymous

2007-11-16 08:07:30 · 15 answers · asked by simon m 2

Airplane departed from A at noon and arrived to B at noon.
Without delay airplane departed from B at noon and arrived to C at noon.
Without delay airplane departed from C at noon and arrived to A at noon of the next day.

Second identical airplane provided similar servce in opposite direction. Second airplane departed from A at noon and proceeded to C, and then to B.

What are arrival/departure times at cities C and B of the second airplane?

2007-11-16 08:03:16 · 6 answers · asked by Alexander 6

1. The square of 5 more than a number.



2. A square has sides of length 3x-2cm. Express the area of the square as a polynomial.

2007-11-16 08:01:38 · 7 answers · asked by lele 2

a 3,5,7
b 4,4,8
c 9,3,14
d 1,2,3

2007-11-16 07:55:16 · 8 answers · asked by Anonymous

Each ordered pair is from an inverse variation. Find the constant of variation.

(0.2, 6)


(5/7,2/5)



Suppose x and y vary inversely. Write a function that models each inverse variation.

x=7 when y=2

x=-3 when y=8

x=1 when y=0.8

x=3/5 when y =5

x= -1/3 when y = 9/10

2007-11-16 07:48:14 · 2 answers · asked by Tabby 2

What is average speed of the family of giraffes?

2007-11-16 07:45:31 · 4 answers · asked by Alexander 6

I don't get how it works!

2007-11-16 07:44:09 · 5 answers · asked by Anonymous

Let's make the assumption that the rate at which a person experiences time, or how fast time seems to "fly," depends on how much time the person has previously experienced.

More the the point, let's say that someone is born on January 1, 2000. A ball which had been held at a height in a uniform gravitational field, is dropped and starts to fall. The person's first year of life corresponds to the ball falling though the first meter.

The interval of calendar time from 1 Jan 2001 to 1 Jan 2002 corresponds to the ball's drop from one meter to two meters below the release point. And so on.

The idea is that each meter the ball drops corresponds to a calendar year of the child's life, but, rather than being proportional to the child's calendar age, the cumulative time in which the ball has been falling is proportional to the child's psychological age.

Assume the person lives to a calendar age of 72. At what age is his life half over, psychologically speaking?

2007-11-16 07:34:46 · 6 answers · asked by elohimself 4

Jenny had driven for 2 h at a constant speed when road repairs forced her to reduce her speed by 10 mi/h for the remaining 1 h of her 152-mile trip. Find her original speed.

2007-11-16 07:08:35 · 6 answers · asked by dani m 1

Jaimey and Mike went out to the fields to pick apples in an apple grove. They picked up 638 apples in 4 days all together out of the 11,700 there. What is the percentage that Jaimey and Mike have taken up for picking the apples? How long will it take them until they pick them all?

I DON'T GET IT. Jaimey and Mike CAN'T pick up that many in even a week! What is wrong with them?! lol! My friend and I are completely clueless, so if you can help... please do!

Thank you!,
Mairy

2007-11-16 06:19:56 · 7 answers · asked by ? 3

#1

3x + y = -1

becomes

y = -1 - 3x

#2

2x - y = -4

becomes

y = -4 - 2x

Is that right?

2007-11-16 06:18:57 · 9 answers · asked by Madera 2

Say I have a glass on a table, in the shape of an inverted frustum of a cone. Upper radius is R[u], lower radius is R[l], height is H. It is filled with soda to a height h.

Question: How far down can I tilt the glass and not spill any soda?

Rephrased: What is the minimum value of theta (0 to 90 degrees) between the table and the side of the glass?

Consider both cases where (1) the bottom of the glass cannot be seen when you've tilted it, and (2) the bottom of the glass can be seen.

2007-11-16 06:18:45 · 4 answers · asked by FredOh F 1

I am supposed to use thefact that the square root of 3 is an irrational number. I know I need to use a proof by contradiction, but I am stuck after that.

2007-11-16 06:09:59 · 4 answers · asked by Anonymous

comput the order of each member of A-4??
A-4 is agroup of even permutations
of S-4
plz explain

2007-11-16 06:04:57 · 2 answers · asked by Dana S 1

There's a friend of mine, I think he's a genius, I mean he studies day and night and has these wierd habits like writing math equations everywhere and always coming up with wierd ideas, he gets top marks in math and the sciences, but one day I asked him to prove one of the circle theorems in GCSE math which is real easy I proved simply, but he can't seem to prove it. What do you think, is he pretending or is his intelligence just not compatible with things like that?

2007-11-16 05:55:08 · 5 answers · asked by Mandél M 3

For the following functions:
(a) Find the intervals of increase or decrease
(b) Find the local maximum and minimum values
(c) Find the intervals of concavity and the inflection points

f(x) = ln (x^4 +27)
f(x) = x + cosx (for x values [-2pi, 2pi])

2007-11-16 05:46:31 · 3 answers · asked by Anniepannie06 2

subtract using vertical method.

7x^2+6x from 9x^2-3




add using vertical method.

5x^2+2x-4, x^2-2x-3, and 2x^2-4x-3

2007-11-16 05:32:43 · 6 answers · asked by God Bless America!~ 4

A small company produces both bouquets and wreaths of dried flowers. The bouquets take 1 hour of labor to produce, and the wreaths take 2 hours. The labor available is limited to 80 hours per week, and the total production capacity is 60 items per week. Write a system of inequalities representing this situation, where x is the number of bouquets and y is the number of wreaths.

2007-11-16 05:31:53 · 5 answers · asked by jaeelarr 1

http://tinypic.com/view.php?pic=7w9qo7l&s=1

2007-11-16 05:25:13 · 5 answers · asked by Anonymous

what does the square root of 200x / square root of 10 x^-1 =


please show work, thank you

2007-11-16 05:22:02 · 4 answers · asked by Anonymous

f(x)-1/3(x-2)^2-3

a) Explain how the parabola that is the graph of f obtained from graph of y=x^2 using appropriate translations and scaling

b) Using (a) what are the coords of the vertex

c) find the x-intercepts and y-intercept

d) What is the image set of f (interval notation)

Thanks for any help

2007-11-16 05:06:13 · 2 answers · asked by Ms X 1

and 3 divide equivalent fractions for 24/60

2007-11-16 05:02:37 · 3 answers · asked by queenie! 1

2007-11-16 04:58:24 · 2 answers · asked by Anonymous

a. same-side interior angles
b. corresponding angles
c. alternate interior angles
d. none of these

2007-11-16 04:55:51 · 2 answers · asked by Anonymous

2007-11-16 04:55:10 · 7 answers · asked by crwlnjeep 4

2007-11-16 04:54:38 · 1 answers · asked by Anonymous