Mathematics - 29 December 2007

2007-12-29 06:07:11 · 3 answers · asked by metman208 2

1 The number of bacteria in a culture at time t is given approximately by y=1000(25 + t e^(t/20)) for 0<=t <=100.
(a) Find the largest number and the smallest number of bacteria in the culture during the interval.
(b) At what time during the interval is the rate of change in the number of bacteria minimum?

2007-12-29 06:00:49 · 2 answers · asked by leonardo 1

3. The data received regarding students scores on a practice OGT needs to be represented in a graph. There were 1200 practice tests taken, and the scores ranged from 0 – 46 points. Which type of graph is appropriate to display the frequency of the data?

A. a circle graph
B. a histogram
C. a line graph
D. a scatterplot
4. Which graphical representation would best display data so that the median and the upper and the lower quartiles can be easily identified as well as any outliers can be seen?

A. a histogram
B. a line graph
C. a stem-and-leaf plot
D. a box-and-whisker plot
5. Paulette kept track of her monthly expenditures and categorized them into housing, utilities, transportation, food, entertainment, and miscellaneous. Which of the following graphical displays will best represent Paulette’s category expenditures in relation to her total budget?

A. a bar graph
B. a circle graph
C. a line graph
D. a scatterplot

2007-12-29 05:57:28 · 2 answers · asked by JetPack 1

In 100g it has 360kcal,

how would I work out how many kcal would be in 71g?
could you show how you do it aswell?

Many thanks, Wish you all the best, take care :)

2007-12-29 05:52:31 · 10 answers · asked by Anonymous

y = e*x^4 + d*x^3 + c*x^2 + b*x^1 + a*x^0
what is the equation for this where y = 0?
and also
y = d*x^3 + c*x^2 + b*x^1 + a*x^0
it is not going to be an answer to any test question.

2007-12-29 05:49:07 · 5 answers · asked by stevenos_2005 2

1. (3x^-2y)^-1/(2xy^-2)^0

a) 1/3x^2y
b) 3xy
c) 3y/x^2
d) x^2/3y



2) [2pq^-1/4q^2]^-1

a) 2/pq
b) p/2q
c) 8pq^3
d) 2q^3/p

Thank you for your help

2007-12-29 05:45:42 · 4 answers · asked by Noname 2

if U stands for element of

then


if A U B and B U C

then A U C


That's pretty easy...is this what set theory is?

2007-12-29 05:38:38 · 2 answers · asked by Anonymous

Sample GMAT question wants me to calculate:
(x+2) - (x+1) - (x-1) - (x-2) where x = -100.

In my reckoning this would be:
(-98) - (-99) - (-101) - (-102) = 204

However the test software tells me it is:
-98 - 99 - (-101) - (-102) = 6

I have copied out the original formula and triple checked it; but I do not understand why it treats -99 differently to -101.

Thanks in advance.

2007-12-29 05:31:35 · 6 answers · asked by Anonymous

when you fell an object from a 10th floor bldg,you can get the height of that bldg. by counting how many seconds until you hear that objects sound.can you give me the formula and the solution of it?thanks a lot

2007-12-29 05:28:59 · 3 answers · asked by thelighthouseartist_0 1

How do I solve this, and what is the answer?

2007-12-29 05:26:06 · 9 answers · asked by frank e 1

Is it possible to construct a rectangle in which the ratio of the perimeter to the length of the long side is equal to the ratio of the length of the long side to the length of the short side?

2007-12-29 05:18:32 · 4 answers · asked by me8md 3

could anyone please show me the steps to solving this cubic equation by factorising it

2007-12-29 05:15:20 · 9 answers · asked by akta p 3

area of an isoseceles traingle wid one side 'x' is

2007-12-29 05:13:47 · 3 answers · asked by Anonymous

find
a) the initial velocity
b)the greatest height reached
c) the total time taken to return to the ground

2007-12-29 05:01:44 · 8 answers · asked by Anonymous

2007-12-29 04:59:58 · 7 answers · asked by x115z 1

2007-12-29 04:54:27 · 8 answers · asked by dumbdumb83 1

2007-12-29 04:50:29 · 4 answers · asked by Anonymous

1)
..____.............
√3x+1 + 1 = x

i don't know what i'm doing wrong but i keep ending up with 3 as the answer
----------------------------------------------
& also this question

2) if the equation x^2 - kx - 36 = 0 has x=12 as one root, what is the value of k?

2007-12-29 04:45:37 · 4 answers · asked by kayy♥ 3

sqrt of -3 divided by sqrt of 25

how would I simplify

2007-12-29 04:33:13 · 6 answers · asked by Anonymous

http://i19.tinypic.com/81i2pmf.jpg

thats the question
I have the answer since my teacher gave us the study guide answers but I keep getting

6 sqrt3 -3 sqrt 2

what do you get and how did you get it?

2007-12-29 04:24:18 · 7 answers · asked by Anonymous

okay i have 200 questions to answer but i cannot answer like 15 of them plaese help me....

3.4 + 2.6 / 6.8 + 3.2

a) 0.41
b)0.60
c)0.62
d)1.31

2007-12-29 04:23:43 · 9 answers · asked by Anonymous

What is the relationship between the area of rectangle ABCD and the area of ΔABC?

A.) The triangle has an area that is half the area of the rectangle.

B.) The triangle has an area that is double the area of the rectangle.

C.) The triangle has an area that is equal to the area of the rectangle.

D.) There is not enough information given to determine a relationship.

2007-12-29 04:13:43 · 5 answers · asked by liyah6 1

I've been working on my homework but I have no one to check it. Could someone please just confirm if my answers are correct and if not, advise me of the correct THEORY as I really want to learn. Thanks!

1. Simplify in index form
a) a^4 x a^5 / a^2
b) (p^2 x q^3 x r^4 (p^2)^3) / pqr
c) Q^3 x Q^-4 x Q^-5

My answers:
a) a^7
b) p^7q^2r^3
c) Q^-6

2. Evaluate:
a) 6^2 x 5^2
b) 121^-1/2
c) 0.5^3 + 0.25^3 x 0.75^3

My answers:
a) 900
b) -11
c) 0.059

3. A beach balls diameter is 1.27 x 10^4 km and a tennis balls diameter is 6.79 x 10^3 km
By calculating their volumes find how many times bigger one planet is to another.

My answer:
I got the beach ball is six times bigger

THANK YOU SO MUCH x

2007-12-29 04:07:27 · 2 answers · asked by Anonymous

trying to prepare for a test when I get back to school and I cant remember how to do this :(




Find the following, given the equation y = x2 + 4x - 21

a. Equation in general form,y = a(x – h)2 + k

b. Coordinate of the vertex

c. Y-intercept

d. X-intercept(s)

2007-12-29 03:57:14 · 5 answers · asked by Anonymous

Eric has a bag of candy. There are 6 grape pieces, 5 orange pieces and 3 lime pieces. Eric picks one piece of candy at random and eats it. Then he takes a second piece. What is the probability that both were grape?

15/91
7/50
7/9
3/20

2007-12-29 03:46:48 · 4 answers · asked by sunny p 1

y=2(x-3)^2+4

Is it (-3,4) or 3,-4

?

2007-12-29 03:42:56 · 6 answers · asked by Anonymous

The probability that the Racoon City High School baseball team will lose tonight is 7/10. What is the probability that they will win?

1/17
3/10
2/9
1/3

2007-12-29 03:31:20 · 5 answers · asked by sunny p 1

What is the contrapositive of "if it is Sunday, then I do not go to school"?

1) If I do not go to school, then it is Sunday.
2) If it is not Sunday, then I do not go to school.
3) If I go to school, then it is not Sunday.
4) If it is not Sunday, then I go to school.

2007-12-29 03:28:25 · 4 answers · asked by Tommy 2

Lets say that it has been established that you have a 50/50 chance of each flip turning out to be either heads or tails. Should you consider the law of averages when predicting the result of the 10th try? Or would you say that no matter what the result of the previous 9 flips, it is still a 50/50 chance of heads or tails?

2007-12-29 03:25:47 · 12 answers · asked by lloyd.salimbao 1

Given f(x) = 7 – 2x find f(-4).

2007-12-29 03:21:52 · 11 answers · asked by cutter1890 1