All Answers

+118741

Anonymous2:
[color=#FF00FF]All square roots of a negative number are imaginary, right? [/color]

SnowRobin is correct

eg
sqrt(-4) = sqrt(4) x sqrt(-1) => 2 x i => 2i

i is the base unit of imaginary numbers.
i= sqrt(-1)

MelodyJan 23, 2014

+118741

tetelove113:
If it takes you 30 minutes to run 5 miles, how long will it take you to run 2 miles

you could say

30/5 = x / 2

and then solve the equation.

MelodyJan 23, 2014

+118741

Guest:
d=(445 1/6)(1.5)

what is the problem,
Do you have to do it by hand or
don't you know how to put it into your calculator?
On your calculator there is probably a fraction button so you press

444 fractionbutton 1 fractionbutton 6 fractionbutton x 1.5 = the answer is 667.75 or 667 3/4

that's it

MelodyJan 23, 2014

+118741

cheesecake.binyard:
if you are trying to save 10,000 dollars how many days would you need to stop smoking? cigarettes cost 6.75 and the person smokes 2 packs a day

I will make it an easier problem and then you can follow the technique on your harder problem

I am trying to save $20
I put $1 in a jar in the morning and another $1 in a jar in the evening.
how long will it take to save the $20

I would start by saying that $1+$1 = $2 goes into the jar ever day
then
20 divided by 2 = 10days.

Now you can go through exactly the same process with your harder numbers

MelodyJan 23, 2014

+118741

Ziharris:
17/25 = m/150

First write them as proper upright fractions

Now multiply BOTH sides by 150

the 150s on the right hand side cancel each other out so you are just left with a calculation on the left hand side.

MelodyJan 23, 2014

+118741

Guest:
HOW MUCH IS A 1/3 OF 228,000

on your calculator it is
1 divided by 3 x 228000 =

MelodyJan 23, 2014

+118741

carrey:
The symbol is ^. I am trying to solve this problem. ^(-12x10)=
The book is saying the answer is 0.592062695 but I can not figure out how they got it. thx

It means ' to the power of '

On a calculator it could be a ^ symbol or it might be a ^x

for your problem, you need a number in front of the ^ symbol or it doesn't make sense.

MelodyJan 23, 2014

+118741

wydawg:
Tom and John are to sit in a row of 6 seats with 4 other people. How many ways are there for the 6 people to sit if both Tom and John refuse to sit on an end seat?

I am not 100% sure but this is what I think.

If you sit Tom and John first there will be 4P2 possibilities (Just for Tom and John)

There are 4 people and 4 chairs left so that will mean 4P4 possibilities for the others (afer Tom and John are already seated)

so altogether I think that there are 4P2 x 4P4 = 12 X 4! = 12 x 24 = 288 permutations.

I am reasonably sure that is correct.

MelodyJan 23, 2014

Noo....hmm 4? Idk

GuestJan 23, 2014

8? :o

GuestJan 23, 2014

+118741

Walt:
If f(x)+2f(8-x)=4 for all real x values, find f(2).

Hi Walt,
Now, thanks to my friend Romsek, I have an answer for you.
It was a bit of a doh! moment for me, I should have worked it out myself.

Anyway the solution starts by setting up 2 equations.
1 for f(2) and
1 for f(6)

then you just solve them as simultaneous equations.

Now it is back to you.

MelodyJan 23, 2014

The symbol is ^. I am trying to solve this problem. ^(-12x10)=
The book is saying the answer is 0.592062695 but I can not figure out how they got it. thx

GuestJan 23, 2014

+134

Right! I was taking 0.75^(1/60) for some reason. Anyways thanks for helping me out, I get it now.

VracesJan 23, 2014

+118741

donnamcelroy:
3/15 =1/?=?/10

Hi donna
This is how you do it.
It took me a real lot of effort to draw this up for you. So I hope you do your best to learn from it.
And, since I spent so long on it I would also like you to thank me.

MelodyJan 23, 2014

+118741

I have no idea. sorry.

MelodyJan 23, 2014

+118741

Phoenix717:
b^3 over c^1/2* c over b^1/3
I need some help with this math problem...

could you please add a pair of brackets to show me exactly what order you want things done in. it does make a difference.
Thanks.

MelodyJan 23, 2014

+5478

the equation for a line through the points (12, -8) and (-4,-40)

So first, find the slope, m.
Slope would be the change in y over the change in x.

slope formula: m = [y1 - y2] / [x1 - x2]

So slope would be (-8 - -40) / (12- -4)
Which would be 2.

Then, plug in the slope and a point into the point-slope formula:
y – y ₁ = m(x – x ₁)

so if you use the first point:
y – -8 = 2(x – 12)
y+8=2(x-12)
Distribute the 2, and move the 8 to the right side to get y=

kitty<3Jan 23, 2014

+118741

Pablo:
How old are you?

My grandmother always told us (me and my siblings) that she was older than her teeth and younger than her tounge.

I guess that goes for me too.

------------------------------------------------------------------------------------------------

My grandmother was born on 16 december 2003. My other grandmother was born on 24th of February 2011.

If they were alive today, how old would they be?

How old might that make me

MelodyJan 23, 2014

+72

A)Let U be the coefficient of friction.
At limiting equilibrium, F=UR
=> U=F/R
Resolving the directions of UR an R gives:
UR-Wsin20=0
R-Wcos20=0
=> U=Wsin20/Wcos20 =tan20 =0.364

Princess Sophie EJan 23, 2014

Thank you very much Kitty<3 that helped a lot.

GuestJan 23, 2014

#17

+118741

Walt:
Ya I'm sure there is, but this is just the way that I thought about it. I tend to overcomplify things and its not always good, but hey. It works!

Yes, I'll give you that, i am sure it works. lol
Instead of looking at the last digit and the second last digit separately, why don't you try looking at the last 2 digits just as a 2 digit number. Think about that.

MelodyJan 23, 2014

+5478