Mathematics - 18 September 2006

Here's a fun puzzle. You're going to go have dinner at your teacher's house. You know he has three kids, but you don't know anything else about them.

Once you get to his house, a boy answers the door. He says "my dad will be downstairs in just a second; you can wait in the kitchen." You wait as you're told, and soon your teacher comes downstairs. He hands you a beverage and says "my oldest child, my daughter Jane, should be home soon."

So, you've met one of his children, who happened to be a boy. You also know that the oldest of his three children is a girl. This means that he has one other child about which you know nothing. What is the probability that this other child is a girl?

(It's not 50%, if that's what you're wondering.)

2006-09-18 17:04:08 · 11 answers · asked by Anonymous

I know that a complementary angle is 90 and a Supplementary is 180 but in the following questions Im not sure how to apply that to get an answer.

Determine whether the statement is ALWAYS,SOMETIMES, or NEVER true.

1.) If two angles are complematary they are both acute angles.

Im not sure if it means both angles combined or separate to be acute.

2.) If lines PN and PQ are perpendicular then angle NPQ is acute

2006-09-18 16:53:24 · 6 answers · asked by MissLady0608 n 5

the sum of 2 numbers is 5 more than twice the first. their sum 29 find the number

2006-09-18 16:52:48 · 11 answers · asked by antelias 2

I am really confused and it's starting to bug me. If anyone can answer me as soon as possible that would be great!

Thanx

2006-09-18 16:35:41 · 15 answers · asked by MinaJay 1

its a right triangle, and its very hard.

2006-09-18 16:23:20 · 12 answers · asked by Rachel 1

2006-09-18 16:19:34 · 9 answers · asked by jordanb310 1

2006-09-18 16:16:58 · 11 answers · asked by MARY I 1

1200s
1600s
1800s
1900s

I have already tried to Google and Yahoo! it. They give me different dates and im not sure which is correct

2006-09-18 16:14:59 · 4 answers · asked by Anonymous

A car traveling at 6.5 m/s accelerates at the rate of +0.87 m/s2 for an interval of 3.6 s. Find vf.

answer in m/s.

don't i use this formula: final velocity=initial velocity + (acceleration * time interval)?

2006-09-18 16:04:01 · 4 answers · asked by tingerpoo 2

2006-09-18 16:02:49 · 13 answers · asked by help??? 1

Hello, I was playing poker and I was 31% to win the game when we were all-in but I lost. However, this loss was insignificant for I had 3x as many chips than him therefore we became even in chips. Later, when the chips were even, I was 42% to win the game and I won therefore winning me the game. My question is ... what were my total odds of winning this game? Ultimately, my odds of winning this game has to be higher than 42% because I was 42% at one point for the win. However, I did have an additional chance of winning at 31%. What is the formula to figure this out? I would think my odds of winning would be something like 42% + ?%. Let me know please, thanks! Also, let me know what the odds would be if it was 80% and 50% =)

2006-09-18 16:02:26 · 2 answers · asked by Ertai2 4

2006-09-18 16:01:07 · 16 answers · asked by viviana 1

- of $56, & the practice time will cost $7.50 per hour. Which inequality should julie use to determine the maxium # of hours, h, she can practice w/o spending more than $300??
Im confused because i dont see how id figure it out without an amount of hours.
I thought the answer was 42 + 56 + 7.50h < or = to 300... what does everyone else think about it?

2006-09-18 16:00:17 · 11 answers · asked by crazybrunette1991 2

9x2+6x+1
--------------
1-9x2

2=squared

I have the answer just cant figure out how to write it. Been busting my brain on this one all night! Some Help would be Great!

2006-09-18 15:55:27 · 6 answers · asked by ahillworks 1

Please, can someone show me howto do this.

2006-09-18 15:51:55 · 7 answers · asked by TehEagle 1

cuiseanaire rods are for maths programs. for kids to learn fractions as well as addition and subtraction.

please help

2006-09-18 15:51:24 · 2 answers · asked by stathoulasynathis 1

hi i am having trouble with this question

Write the equation of a circle centred at the origin with radius 1 in polar form (in its simplest form).

any help would be gratefully appreciated

2006-09-18 15:46:50 · 6 answers · asked by zz06 3

I'm preparing for a math test and has forgot something >_<
What're " factors"?
Could you please give me an example of it.
Thanks.

2006-09-18 15:44:45 · 4 answers · asked by Bonnie 1

Whats the value of m?

2006-09-18 15:43:39 · 4 answers · asked by Anonymous

A bus slows down uniformly from 51.3 km/h (14.3 m/s) to 0 km/h in 16 s. How far does it travel before stopping?

answer has to be in seconds.

2006-09-18 15:38:51 · 2 answers · asked by tingerpoo 2

Hi... Can someone help me get started with finding the equation of a line parallel to the line 4x-5y-7=0? I found the slope, but I'm not sure how to apply it. Don't I need a set of x & y coordinates from the first equation. Thanks!!

2006-09-18 15:37:59 · 8 answers · asked by math dodo 2

does the number .0558 have three significant figures of four signifigant figures?

2006-09-18 15:35:29 · 14 answers · asked by Simply Me 5

2006-09-18 15:29:36 · 5 answers · asked by Rania R 1

2006-09-18 15:21:51 · 3 answers · asked by Violet G 2

I have this formula:
P=L*.10W+.5L+.5W

I have to solve it for L, meaning that I have to reconfigure the formula so that L is on one side. For the life of me, I cannot figure this out.

(It's not important, but P is price, L is length, and W is width.)

2006-09-18 15:08:00 · 5 answers · asked by Kristen 1

can you explain how to get to the answer please.

2006-09-18 15:06:30 · 4 answers · asked by mylipshot 2

2006-09-18 15:03:01 · 5 answers · asked by Anonymous

what is the ^6 root of 27.. and how?

also
romor spreads like an epidemic at a rate directly proportional to the number of people who hear it. rumor spreading can be modeled by the eq. H= C / 1 + (C - S)e ^-.4t where c ius the total number of people in the community, S is the number of people who initally spread the rumor, and H is the number of people who have heard the number after t minutes. In a school of 1800 students, one studen going to lunch on friday overhears the principal saying the following monday there will be a surprise school holiday. about how many student will have heard the rumor after 45 minutes??
i keep working this out and get a number high er than 1800, please help!!! best answer anyone??

2006-09-18 15:01:32 · 3 answers · asked by abbs 2

please help

2006-09-18 14:54:23 · 4 answers · asked by Dylan C 1

*for add/sub**
if i add 67.17and207.2 how may sig figs should the number have?
**for multiply/divison**
if i times 67.17 by 207.2 how many sig figs should that number have?

2006-09-18 14:52:46 · 6 answers · asked by Simply Me 5