Mathematics (Science & Mathematics) - 3 September 2007

(9.52*10^4)*(2.77*10^-5)/(1.39*10^7)*(5.83*10^2)

First i did, (9.52*2.77)=26.37040*10^-1

then i did, (1.39*5.83)=8.10370*109

i dont know if im doing it right but can someone show me step by step how to solve this problem. thanks

2007-09-03 18:53:09 · 3 answers · asked by amy 1

0 ⤊

How do you find angles in pentagon which is in a circle, when you are only given two angles.?

The pentagon which is in the cirlcle has two angles which are known, one is 50 degrees the other is 80 degrees, you are asked to find the other three angles. I know that in a quadilateral and trapezium all angles add up to 360 degrees and in a trainlge they add up to 180 degrees so what about a pentagon?

2007-09-03 18:51:44 · 2 answers · asked by NaNeC 1

4 ⤊

Wow. I need help. Find f( x + Δx ) for f(x) = x² - 2x - 3. I don't remember how to do this at all.?

2007-09-03 18:46:50 · 3 answers · asked by Lily 2

1 ⤊

Probability?

1)You have three boxes. One contains two pennies, one contains a penny and a dime and the third contains two dimes. You randomly select a box and randomly pull out a penny. Is the following statement correct? There is a 50% chance that the other coin in that box is a penny. Explain.

The correct answer is no. There is something wrong with the statement, but I don't know what.

2) You are told that there is a 25% chance of it raining on any given day during August. You are also told there is a 50% chance of rain if it rained the day before and a 16.66% of rain if it did not rain the day before. Determine if these probabilities are all consistent.

I don't know. I am thinking that since there is a 25% chance of raining on any given day, it will rain for about 25% of the month. The chance of rain should be greater then if it didn't rain the day before so I don't think the probabilities here are sensible. Am I correct?

2007-09-03 18:46:27 · 2 answers · asked by Vu 3

0 ⤊

Last integral question for the day...?

This one is a bit different from the other problems...so here it goes:

Given f" is continuous
f(1) =2
f'(1) = 5
f(4) = 7
f'(4) = 3

Find integral (upper: 4, lower:1) xf"(x)dx

I take it that I'm supposed to value of f"(4) and f"(1) and find the difference of them, but how do you find a function for f and f'?

2007-09-03 18:45:08 · 2 answers · asked by J.W. 2

3 ⤊

Two consecutive even integers?

Given that (x+37)/5 and (7x-1)/2 are two consecutive even integers, find the value of x.

Ans: x =3

Please show me the workings. Thanks a lot. :)

2007-09-03 18:33:16 · 9 answers · asked by ♪£yricảl♪ 4

8 ⤊

Need help with this: 5x+8=x-2?

answer is -5/2 but what're the steps?

2007-09-03 18:18:19 · 10 answers · asked by sa 3

4 ⤊

I need your help Algebra 2 experts! Please?

It has been 2 years since I did math. I pretty much forgot how to do these. Any tips and help would be appreciated! Please and thank you!

Solve:
1. x + 3/2 = 3/4(x -1/2)
2. x + 3/5 = 7/5(x+1)
3. 5x = 4/5(5x-2)
4. 5/4(4x + 2) = 3
5. x + 4 = 2x - 8(1/4x - 1/4)

6. A movie ticket costs $6.50. You have $35.00 to buy tickets and popcorn for four people. How much money is left to buy popcorn after the tickets are paid for?
7. The bill for your automobile repairs was $265.74. The cost for labor was $52.00 per hour. The cost for materials was $135.74. How many hours did mechanic work on your automobile?

2007-09-03 18:07:36 · 6 answers · asked by Anonymous

0 ⤊

I need help solving the indefinite integral of 1/(1+x^4). Do I use Tan^-1 or log?

2007-09-03 17:08:51 · 2 answers · asked by Anonymous

6 ⤊

probability question?

. 15. some 3 pairs of white socks, 4 pairs of red
socks and
2 pairs of black socks among that what is the
probability that
correct pairs can be taken out?

2007-09-03 16:56:55 · 5 answers · asked by Anonymous

0 ⤊

I can't figure out how to graph this! Calculus?

I don't know how they are coming up with the table of values for graphs like this. "r(t)=" or "r(t)=". My book doesn't explain. It just says "We can make a able of values, or we can eliminate the parameter...." I just can't visualize this stuff. Please help, I'm lost!

2007-09-03 16:47:11 · 2 answers · asked by Kayla G 1

7 ⤊

whats 10 x 111000000000000000000000000000??

questions

2007-09-03 16:46:04 · 10 answers · asked by Teri H 1

0 ⤊

As Kath leaves Waco while driving her car to Austin she accelerates at a constant rate. If her speed increases

from 30 mph to 75 mph in 22 sec, determine her acceleration in units of ft/sec/sec.
hint: 60 mph=88 ft/sec

2007-09-03 16:43:11 · 2 answers · asked by sdt3 1

0 ⤊

another precalc question?

can someone pls explain how to do this crazy equation:

"a rectangle, which is on the 1st quadrant, has one corner on the graph of y=25-x^2, another at the origin, a third on the positive y-axis, and the fourth on the positive x-axis.
1) express the distance 'D' from the point 'P,' which is a corner of the rectangle on the graph, to the origin 'O' as a function of 'X.'
2) express the area of the rectangle 'A' as a function of 'X'
3) what is the domain of 'A'
4) graph A = A(x) "

lol

2007-09-03 16:34:48 · 1 answers · asked by nasgmx,zncv xc 2

1 ⤊

I need help on my math?

I need help on my math
the problem is
[x^(-2) - y^(-2)]/[x^(-1)+y^(-1)] and i'm suppose to simplify the fractional expression. the answer is (y-x)/(xy). how do i get that answer?

2007-09-03 16:31:06 · 4 answers · asked by Anonymous

0 ⤊

Math question...?

ok this is the question....I am checking my daughters homework and I want to make sure it is right......

The sum of my two digits is 13. I am not divisible by 2. List all possible numbers I could be.

Answer__________

Wouldn't that be 6 and 7 .....or 10 and 3 etc...?

2007-09-03 16:30:59 · 4 answers · asked by Angel girl 4

0 ⤊

precalc question?

its an easy question i know, but i dont get it

"the perimeter of a rectangle is is 50 ft. express its area 'A' as a function of length 'L' of a side"

2007-09-03 16:30:57 · 3 answers · asked by nasgmx,zncv xc 2

0 ⤊

Can someone check if my answer for this quick math problem?

A concert promoter estimates that if he sells tickets at a price of $15 each, he will sell 200 tickets. For each dollar that he decreases the price he will sell 20 more tickets. Express the total revenue R from ticket sales as a function of the ticket price p. Graph the result and estimate the optimum ticket price.

My ANSWER:

x,y
15, 200

slope= -20

200= -20(15)+b

200+300=b
b=500

Equation for price: (p) -20x+500

Equation for Revenue: ???

How do you write the Revenue function as a function of the ticket price p?