All Answers

+118741

zethwolf:
Am I supposed to guess the possible ages and plug them in?

No you were supposed to solve the equations simultaneously. I take it you don't know how to do that?

MelodyFeb 15, 2014

Am I supposed to guess the possible ages and plug them in?

GuestFeb 15, 2014

#87

+118741

Excellent work Grammar Fascist!

NEW PUZZLE
Rules:
You have to use some or all of the numbers to make the magic number. You are not allowed to use any of the numbers twice. (Unless one was written twice in the first place)
You can use brackets, +, -, x, or divide and that is it.

EASIER ONE
9,3,7,1 and the magic number is 66

HARD ONE
1,2,5,8,9,25,50 and the magic number is 753

Happy Calculations

MelodyFeb 15, 2014

+118741

Captain_Kangaroo:
The flowers were marked up 120% of the cost to get get a selling price of $4.40. They did not sell well, so the florist reduced the mark up to 70% of the cost. What was the new selling price?

Hi Captain_Kangaroo,
cost * 120% = $4.40
C * 120/100 = $4.40

C = $4.40 * 100/120
So new price must be

NP = $4.40 * 100/120 * 70%
NP = $4.40 * 10/12 * 70/100
NP = $4.40 * 10/12 * 0.7
etc

MelodyFeb 15, 2014

+118741

zethwolf:
Anna is seven years younger than Brandi. Three years from now Anna will be twice as old as Brandi was nine years ago. How old will Brandi be six years from now.

Hi zethwolf,

Let Anna's age be A years and Brandi's age be B years

A = B - 7
A+3 = 2 ( B - 9)
solve these simultaneoulsy, it is a good idea to also check your answers against the worded problem.
Once you have B you can easily work out how old Brandi will be 6 years from now.

will you be alright with the question now. Think about it for a while but then repost if you don't get it or can't finish it.

p.s. This isn't a probability question.

MelodyFeb 15, 2014

#10

+118741

Mitt Romney:
Oops! It appears I was rude to the wrong person. This just made it very awkward... Sorry to Rom. It wasn't intended to be said to you. However, I do regret writing that last sentence down, no matter who I said it to. After reviewing it, I concure with Rom's answer.

Well, Mitt Romney, it appears that you have done your penance.
I am sure that we will all have a great relationship from now on.
You are very welcome here. Why don't you sign up and make it a formal alliance.

http://web2.0calc.com/questions/become-a-member-why-would-you-want-to

Highlight, right click choose goto.

Warm regards,
Melody.

MelodyFeb 15, 2014

+6252

don't sweat it

RomFeb 15, 2014

+6252

Quote:
how many atoms are contained in 2.45 grams of sulfur

The Molar mass of S = 32.065 g/mole

The number of atoms, N, of an element is Avogadro's number times the number of moles of the element

N = 6.0221413x10 ²³ x 2.45/(32.065) = 4.6x10 ²²

RomFeb 15, 2014

+118741

pugsrule123:
what's pie times radius squared?

The maths pi doesn't have an e

pi x r ² is the area of a circle.

MelodyFeb 15, 2014

+118741

Frankcare760:
560sq. ft is ? sq. yds.

Well, a yard is 3 feet by 3 feet. = 9 square feet

so it must be 560 / 9 sq yards

MelodyFeb 15, 2014

+6252

ft ² = ft * ft = (yd/3) (yd/3) = yd*yd/9 = yd ²/9

RomFeb 15, 2014

+118741

Chicken:
what is the common multiple of 8 and 7

The multiples of 8 are
8,16,24,32,40,48,56,64,72,80,....
You have to find the one that is also a multiple of 7.

MelodyFeb 15, 2014

+118741

mmjl:
Ask a Math Question!
WHAT IS 30 PERCENT OF 80THOUSAND

30/100 x 80000=

MelodyFeb 15, 2014

+118741

_jacqulynnneedshelp:
what is 0.0000000000000000001 as a power of 10

It is a bit hard to read. but
say there are 18 zeros BETWEEN the decimal point and the 1 then
You would need to move the point 19 places to get it behind the 1.
Hopefully you know that this is a very tiny number.
Tiny numbers have negative powers of ten so your answer is
1. x 10 ^-19
=10 ^-19

Now I would like you to work through this web page
Jut highlight, right click the press goto.

http://www.mathsisfun.com/numbers/scientific-notation.html

MelodyFeb 15, 2014

+118741

jjone42:
degree measure in radians
330

360 degrees = 2pi radians
180 degrees = pi radians
divide both sides by 180 and you get

180/180 degrees = pi / 180 radians
1 degree = pi / 180 radians
so
330 degrees = 330* pi / 180 radians
330 degrees = 33pi/18 radians.

MelodyFeb 15, 2014

#15

+118741

Stu:
makes sense. I got it in the first bit. Just rationalising it in an improper fashion previously. Thanks.

You are welcome.

MelodyFeb 15, 2014

+118741

tlamb:
how do i input fractions

There is no fraction button on the site calculator if that is what you mean. sorry.

If you wanted to enter 53 and 7/8
you would have to enter 53+7/8. If it were part of a larger question you would need to put it in brackets.

MelodyFeb 15, 2014

+118741

1*(9-9)*4 = 0 ...... Grmal
-1-9 +9+4= 3 ...... Melody
-1+9/9+4 = 4 ......Melody

I'm getting all the easy ones.

MelodyFeb 15, 2014

#14

+1313

makes sense. I got it in the first bit. Just rationalising it in an improper fashion previously. Thanks.

StuFeb 15, 2014

#13

+118741

Stu:

And yes, I just had this question regarding transposing a square root posted in this thread.
side question ot, when removing Sqrt in transposing given t= sqrt2mg, solve for g. it is easiest to remove the Sqrt first I get that, but answer given is g = t²/2m. I was about to give this answer, but isnt everything under the Sqrt squared to remove it, so.. when transposing /2m shouldn't they be squared. I get that it isn't so I would just like to know why as I'm sure it is a simple answe.r. thanks. ie can't move the Sqrt with out moving the 2m to the left and squaring it also?

In your question 2mg was all under the square root sign.

So when you write it in here, you have to write sqrt(2mg)
your question is
t = sqrt(2mg)
square both sides and you get
t ² = 2mg
divide both sides by 2m and you get
t ²/(2m) = g (NOTE: you need the brackets here too otherwise you would be dividing by 2 and multiplying the whole answer by m)
g = t ²/(2m)

Now I know that you are still confused. I will look at this with you
t = sqrt(2mg)
t = sqrt(2) * sqrt(m) * sqrt(g)
t ² = [ sqrt(2) * sqrt(m) * sqrt(g) ] ²
t ² = sqrt(2) ² * sqrt(m) ² * sqrt(g) ²
t ² = 2 * m * g
t ² = 2mg
See, all the terms were squared.

Think about it for a while and then tell me if you understand.
warm regards,
Melody.

MelodyFeb 15, 2014

Dunno. Maybe you should look it up...

GuestFeb 15, 2014

+118741

Stu:
How much wood would a woodchuck chuck if a woodchuck could chuck wood would be no wood chucked by the woodchuck chuck if the wood chuck chuck had Ice cream. bahahaha.

http://www.youtube.com/watch?v=WRu5pQU38K4

Very cute stu

MelodyFeb 15, 2014

Feb 14, 2014

#11

+118741