Mathematics - 23 June 2007

1. Factor

3x^2 - 7xy - 6y^2

2. When a ball is thrown, its height in feet h after t seconds is given by the equation

h = vt - 16t^2

where v is the initial upward velocity in feet per second. If v = 15 feet per second, find all values of t for which h = 3 feet. Round answer to 2 decimal places.

3. What is the x - intercept(s) and the coordinates of the vertex for the parabola y = x^2 +4x-5. If there is more than one x-intercept seperate them with commas.

Thank you

2007-06-23 22:54:49 · 4 answers · asked by CHRISTOPHER R 1

I Know Distance.
I Know Time.

I want to know what the constant acceleration and decelleration would be if I left my destination and arrived at my destination at 0m/s.

For instance.
au = Astronamical Unit
ly= Light Year ( 63240au)

Distance = 10ly (632400au)
Time = 180 seconds

What is your acceleration/deceleration in AU/S/S

What equation would you need to work out acceleration if you accelerated and then decelerated at a constant rate for half of the journey?

2007-06-23 22:42:41 · 2 answers · asked by Valentine O 1

center at (-5, -1); radius (square root of) 3

Problem is... How can you find/plot a square root?

2007-06-23 22:16:31 · 3 answers · asked by Belx2 2

From a well-shuffled pack of cards (whatever that means!), what is the probability of finding JUST two cards, of the same rank (any rank), next to each other?

Or maybe I should have worded it as " what is the probability of finding AT LEAST two cards of the same rank next to each other?"

Either way, I have no idea how to tackle this, but my suspect intuition tells me the probability is > 0.5 from my son's practical experience.
Is this an impossible ask or are my probability skills waning?

2007-06-23 22:10:17 · 3 answers · asked by falzoon 7

I know the answers (0, +/-60 and +/-180)...but i don't know the working. Can anybody help?

2007-06-23 21:51:03 · 5 answers · asked by Anonymous

2007-06-23 21:45:45 · 11 answers · asked by Anonymous

use binomial thoerem

2007-06-23 21:17:43 · 5 answers · asked by sukka v 1

take points A(7/2,0), B (0,7), C(-7/6,0) on the xy-plane. the parabola y = -x^2+ax+b is tangent to both lines BA and BC.

1) determine a and b
2) calculate the area of the domain bounded by the line BA, the parabola and the y-axis.

guys.. i dont want the answers i want to know how to solve this problem.. please HELP!! this is going to determine my future.

2007-06-23 21:04:10 · 3 answers · asked by 2 wierd 2 live but 2 rare 2 die 1

The ratio of ten-cent coins to twenty-cent coins in a puse is 3:5.If 6 twenty cent coins are taken out of the purse,the ratio of ten cent coins to twenty cent coins becomes 1:1.How many ten cent coins are there in the purse??

explanation would be very helpful.
thanks!

2007-06-23 20:51:01 · 7 answers · asked by krystal_engel 3

For example...

If out of 500 students,
192 like brand A
131 like brand B
217 like brand C
99 like A & B
82 like B & C
77 like A & C
50 like all three
...
how many only like brand B?


...besides trying to come up with a venn diagram?

Please show me how. Thank you very much.

2007-06-23 20:49:07 · 6 answers · asked by inthemaking 2

Does anyone know what the hell a quadrant angle is and how it looks like?!?

2007-06-23 20:24:53 · 7 answers · asked by Smith 1

how do you put this in scientific notation?

0.076 000 000

I for one know that it isn't 7.6 x 10 to the negative one because that lands up to 0.76 thanks!!

2007-06-23 20:22:05 · 6 answers · asked by real 2

For example...

If out of 120 students,
60 like prof. A
40 like only prof B
&
79 don't like prof B,
how many like both professors?

...besides trying to come up with a venn diagram?

Please show me how. Thank you very much.

2007-06-23 20:05:35 · 5 answers · asked by inthemaking 2

2007-06-23 18:52:22 · 7 answers · asked by matcav2002 1

2007-06-23 18:29:08 · 6 answers · asked by matcav2002 1

I have (x^2+1)y'=xy

The answer I get is y = Ksqrt(ln|x^2+1|)

But the answer in the book is y = Ksqrt(x^2+1)

Why is the natural LOG not there?

I used the udu substitution for the integral x/(x^2+1)

2007-06-23 18:20:55 · 4 answers · asked by ? 3

A street light is at the top of a 16.5 ft. tall pole. A man 5.6 ft tall walks away from the pole with a speed of 4.5 feet/sec along a straight path. How fast is the tip of his shadow moving away from the pole when the man is 31 feet from the pole?

2007-06-23 18:05:22 · 2 answers · asked by Anonymous

Let f(x)=x^3-7x^2+5x
Find all values of x for which f(x)= -1
(Kindly show all solutions. I'm still a fourth year highschool student so I don't know.)

2007-06-23 17:21:54 · 9 answers · asked by Anonymous

2. Fabbie is driving 82.3 miles to her aunt's house. After 31.8 miles, she stops for lunch. How much further does she have to drive. What is the correct equation to use , to solve this problem?
3.What fraction is equivalent to 0.65?
4.Which three-dimensional figure below has exactly 5 faces?
5.How can you change gallons into quarts?
6.Arlene's bedroom measures 12 ft x 10ft. Which formula can be used to find the area of Arlene's room?
7.Jill made 16 signs for a school party. She used a roll of paper 43.2 meters long. What was the average lengh of the signs?
8. Oliva had 6 yd of fabric. She used almost 3 1/2 yd for a jacket. Which could be the amount of fabric she had left?
9.Show a mental way to compute 52x18?
10. 9/10 -2/10=
11.Marie baked 24 cookies. She gave 4 to her neighbor. What fraction of her cookies did she gave to her neighbor?
12.What is the decimal standard form of twenty tthree and five hundredths?

2007-06-23 17:21:05 · 3 answers · asked by rosemariestewart64 1

I've been sitting here trying to figure this out for over an hour.

The question says: convert the hexadecimal number ABB093BABBA to its octal expansion.

I've tried every which way that I know how, but I keep getting answers with scientific notation. Please help me someone.

2007-06-23 16:48:07 · 6 answers · asked by TCM 3

A one story building, having dimensions of 80ft by 50ft by 20ft high, encloses a volume of 8000 cubic feet and has a floor space of 400 square feet. True or False?

Thank you!!!!!!

2007-06-23 16:43:14 · 8 answers · asked by Brenda 1

the picture looks like a square and a circle is inside of it. Also, the picture shows a line passing through half of the circle which is being called r. For radius.

2007-06-23 16:39:17 · 4 answers · asked by chris 1

2007-06-23 16:35:52 · 4 answers · asked by Jennifer T 1

Find the unsigned area between the points x = -1 and x = 3 for the curve y = 2 - 2e^(-x)

2007-06-23 16:22:20 · 4 answers · asked by iamdaroot 2

2007-06-23 16:21:44 · 7 answers · asked by Brenda 1

Factor:
2w to the 4th power Y to the 4th power - 2y to the 4th power

2007-06-23 16:17:25 · 3 answers · asked by Cari Y 1

What is the solution for:
a.How many seconds in 1 decade?
b.How many hours in 5,638,259,215 seconds?
c.How many seconds in 55 centuries?
d.How many minutes in 65 years?
Pls answer this....

2007-06-23 16:17:04 · 5 answers · asked by Lemons_kisses 1

3x to the second power minus 8y to the second power

x = -6
y = -1

2007-06-23 16:15:30 · 5 answers · asked by Anonymous

Find the time necessary for an initial investment to double in value when placed in an account that pays 6% compounded monthly. Can you please show me the steps on how you arrived to the answer?

Thanks a bunch,
Big Bird

2007-06-23 16:13:13 · 3 answers · asked by Anonymous

H = 8 yards
Area of Base = 24 square yards

2007-06-23 16:11:23 · 3 answers · asked by Brenda 1