All Answers

+130561

At noon sarah headed from elk city to Idabel at 60 mph. Two hours later, Joan headed from Idabel to elk city at 46 mph. If it is 332 miles from Elk city to Idabel, what time did they meet?

Mmmm....let's look at this again.....

The cities are 332 miles apart - if I'm reading the question correctly. When Joan starts traveling, Sarah has already traveled 120 miles (2 hrs. @ 60 mph). So the distance between them when Joan starts is now just 332 - 120 = 212 miles. Since they're heading towards each other, their combined rates are (60 + 46) = 102 mph.. So, dividing the distance left by the combined rate we get......212 / 106 = 2 hrs.

Thus, Sarah has traveled two hours when Joan starts and it takes her two more hours to meet Joan, so they meet at 4 PM.

I believe that's correct.

CPhillMar 14, 2014

+142

preciouslove:
(4x2 - 5x - 2)(x2 + 5x + 2)

You have to know that you need to take the 4x ² and multiplicate it by x ², after that by 5x, and finaly by 2, and you do the same thing whit the second factor and the third.

You'll have this answer:

4x ⁴ + 20x ³ + 8x ² - 5x ³ - 25x ² + 10x - 2x ¹ -10x - 4

Now, you need to simplicate the answer. At this point, you need to locate the same exponent to all X's. you have x ⁴, x ³, x ², x. Simplificate the equation.

Know that x ⁴, x ³, x ², x ARE NOT THE SAME THINGS, they are like apple, banana and orange!

4x ⁴ + 15x ³ - 17x ² -4

samgelinasMar 14, 2014

+6252

Quote:
At noon sarah headed from elk city to Idabel at 60 mph. Two hours later, Joan headed from Idabel to elk city at 46 mph. If it is 332 miles from Elk city to Idabel, what time did they meet?

Let Idabel be at 0. Then Elk City is at 332.

Sarah's position is s = 60T

Joan's position is j = 332 - 45(T-2)

solving these we get

60T = 332 - 45(T-2)

105T = 422

T = 422/105 = 4.02 = 4hrs 1.14 minutes

RomMar 14, 2014

+142

snezhanaward1:
find the volume of a sphere when r=2 then double it and find the volume

4pi r³
3

When pi is 3.14159......

samgelinasMar 14, 2014

+6252

Teachers Teaching with Technology?

RomMar 14, 2014

+6252

Quote:
how to calculate the probability of randomly guessing the given number of correct answers on a 30 question multiple choice exam that has 4 choices

the probability of answering any single question correctly by chance is 1/4.

This is the p of a binomial distribution for the number of correctly answered questions.

Pr[correctly answering k questions out of 30] =

just replace p with 0.25 in the formula above.

RomMar 14, 2014

+6252

Quote:
what happens to the volume of a sphere when the radius is doubled? find the volume of a sphere when r=2 then double it and find volume.

for a sphere Volume = (4/3) pi r ³

so doubling the radius makes the volume go up by 2 ³ = 8.

RomMar 14, 2014

+6252

next to

RomMar 14, 2014

PLEASE EXCUSE MY DEAR AUNT SALLY

GuestMar 14, 2014

+64

Hello Lt_Soul,
We are searching a line e: y=mx+b.
If e(line) parallel to y=2x+5 then the two lines have the same Slope! So m=2.
Also, if the point A(-7, -9) we can easy find b:
(y-y_A)=m(x-x_A) => (y-(-9))=2*(x-(-7))

(y-(-9))=2*(x-(-7))

Finally, the line which is parallel to y=2x+5 and passes through the point (-7, -9) is the line y=2x+5

Dms

DmsMar 14, 2014

+64

Hey, check this calculator: http://web2.0calc.com/

sqrt(170)

Dms

DmsMar 14, 2014

+33666

spartian78:
At noon sarah headed from elk city to Idabel at 60 mph. Two hours later, Joan headed from Idabel to elk city at 46 mph. If it is 332 miles from Elk city to Idabel, what time did they meet?

Suppose Sarah has been travelling for x hours when they meet. This means Joan has been travelling for x-2 hours.

Distance travelled by Sarah in x hours is 60x miles.
Distance travelled by Joan in x-2 hours is 46(x-2) miles.
The sum of these two distances must be 332 miles, so

60x + 46(x-2) = 332

From this you can find x, the number of hours past noon.

AlanMar 14, 2014

Go to www.shutthefuckup.com/Eli to find out

GuestMar 14, 2014

+142

It's just an impossible question. Because, with the choice of answer that you have, the lowest is 78...

So, 78 for joseph and 156 for Nick...

And, Alice have 20% of them...

234 sweets + 40 sweet = 274 sweet...

it's not possible with those answer.

OR it's 2000 sweets.

OR this probleme it's not slvable whit those answer..

BUT if you want to know, how much NICK have, it's solvable, BUT there's too much possibilities..

samgelinasMar 14, 2014

+118725

Katy:
Wait , hold on hold on

Why 3x ? How 'bout Mary?

It doesn't say anything about how much Mary gets in the questions. It only says that Nick gets twice as much as Joseph and Alice gets 40.
the ratio of Joseph's share to nick's share is 1:2 If Joseph gets x lollies then Nick gets 2x lolllies. x+2x=3x. Mary gets whatever is left over.

The MOST that Joseph can get is 53. He could get a lot less.

Does that help

MelodyMar 14, 2014

+33666

angles2.PNG

AlanMar 14, 2014

Wait , hold on hold on

Why 3x ? How 'bout Mary?

GuestMar 14, 2014

+118725

Katy:
MARY HAD 200 SWEETS WITH HER. SHE SHARED THE SWEETS WITH JOSEPH, NICK
AND ALICE. ALICE GETS 20% OF THE SWEETS.NICK GETS TWICE MORE SWEETS THAN JOSEPH. HOW MUCH SWEETS DOES JOSEPH GETS?

A. 79 SWEETS
B. 89 SWEETS
C. 78 SWEETS
D. 90 SWEETS
E. 100 SWEETS
Help me

4 people are sharing 200 sweets

Alice gets 20%
20% of 200 = 20/100*200=40lollies
So there are 160 left for the others to share.

Let Joseph get x lollies
Nick gets twice that many so he must get 2x lollies
we don't know how many Mary gets.

Nick +Joseph = 3x lollies and I guess Mary will get some as well.
So
3x < 160
x < 53.3
I don't think that any of those answers are correct. The most sweets that Joseph can get is 53. He could get less than that but he can't get more.

If Joseph gets 53, nick gets 106, Alice gets 40 Mary only gets 1.

MelodyMar 14, 2014

+118725

soxajn:
i am going to exam next week an cant use the internet so i want to know if it is possible to download this as a ofline software?

I am not terribly familiar with the calculator but I do not think that is possible. Sorry.

MelodyMar 14, 2014

+118725

marshawn:
(3.04*10^4)*10.0

3.04 * 10 ⁴ * 10 = 3.04 * 10 ⁵

= 304,000

MelodyMar 14, 2014

+118725

Suge Knight:
If the rate of interest is 7.3% p.a. effective, find the equivalent nominal rate of interest p.a. if it were payable 2 times a year. (as a %, to 2 decimal places)

(j2 is required and not the half-yearly rate.
Check that your calculated value of j2 is slightly smaller than the j1 value of 7.3%.)

Hi Suge Knight,

Let me see what i can do for you.

(1+0.073) ¹ = (1+(r/2)) ²

1.073 = (1+(r/2)) ²

sqrt(1.073) = 1+(r/2)

r/2 = sqrt(1.073) -1 = 0.035857 This is the efective 6 monthly rate.

r = 2[sqrt(1.073) -1] = 0.071714266 This is the nominal yearly rate.

The nominal yearly rate to 2 dec places is 7.17%

MelodyMar 14, 2014

+118725

brainiebean123:
if i were making 200 sandwiches and my sister ask for 144 of the sandwiches how many sandwiches would be left over....?? # yolo dificult##

:mrgreen: [color=#FF80FF][/color]

Hi Brainiebean123,

200-144=

MelodyMar 14, 2014

#69

+118725

+14

Hi everyone,
There were lots of great answers provided today by Samgelinas, Alan, Kitty<3, ChrisP and CPhill.
Unless I am very much mistaken, ChrisP and CPhill are the same person. Thanks for joining up Chris.
Jedithious left a very nice thank you for Chris. Jedithious has been with us for a long time, he has always had great manners.
Jedithious, I'll have to introduce to Reinout, he might be able to tempt you with some puzzles.

I'd still like an answer to my yesterday's question. It was directed mainly at you Chris. I just want to know if it is usual notation or if you just used your powers of deduction
Thankyou everyone.
Melody.

MelodyMar 14, 2014

+118725

Guest:
if 9% equals 6.6 then what does 0.3% equal

There are at least 2 very different ways to do a question like this.

Method 1
Let x be the number that you are looking for
x / 0.3% = 6.6 / 9%

x = 6.6 / 9% * 0.3%

x = 6.6 / 9 * 0.3

x = 0.22
----------------------
Method 2
9% is 6.6
1% is 6.6/9
0.1% is 6.6/9 divided by 10
0.3% is 6.6/9 divided by 10 * 3
0.3% is 0.22

If you are comfortable with algebra, I think the first way is better.

MelodyMar 14, 2014

+33666

HELLO:
What is the fundamental frequency for an organ pipe that is 4 m long? The pipe has one end that is open and another end that is closed. Use a wave speed of 340 m/sec.

There are two things you need to know for this:

1. speed = frequency x wavelength

2. For a pipe that is open at one end and closed at the other the fundamental will occur when one quarter of the wavelength fills the pipe (the closed end is a node, the open end an anti-node).

So, first calculate the wavelength of the fundamental (four times the pipe length), then use the formula above to find its frequency.

AlanMar 14, 2014

All Answers 358516 Answers

1 Online Users

Top Users

Sticky Topics