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A
And the radius is 3

MelodyJan 10, 2014

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Good work Bliu1. I think that I have interpreted the words just a little differently from you,

John is 5 years older than Mary. This is the first equation on all 3 choices.

In 10 years, twice John's age decreased by Mary's age is 35,
In 10 years John will be (y+10) years and Mary will be (x+10) years so
2(y+10) - (x+10) = 35

and John's age (in 10 years time) will be twice Mary's current age. [ i take current age to mean her age today, not her age in 10 years time]
What does this sentence tell you?

Maybe there is more than 1 correct answer.
Find their ages now.
If x is Mary's age now and y is John's age now, which system of equations could not be used to solve the problem?

1. y = x + 5 and y + 10 = 2x
2. y = x + 5 and 2(y + 10)-(x + 10) = 35
3. y = x + 5 and 2(y + 10) = x

MelodyJan 10, 2014

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Guest:
Simplify √110

You have to look for a square number, bigger than 1, that go into 110
Square numbers are 1,4,9,16,......
There are no square numbers that go into 110 therefore BLiu1 is absolutely correct, you cannot simplify sqrt(110)

MelodyJan 10, 2014

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anon:
f(x) = -x^2 + -3x +10

The question didn't say but I assume that you are supposed to factorise this?

f(x) = -x ² - 3x +10

i'd start by factorising out -1

f(x) = -1 ( x ² + 3x -10)
f(x) = - ( x ² + 3x -10)

Now you need to find 2 numbers that multiply to give -10 and add to give +3
I can see immediately that one is neg and one is positive (mult to give neg) and the big one is the positive one (they add to a positive)
So straight away i can see it must be +5 and -2

F(x) = -(x+5)(x-2)

Note: whole numbers like 5 and -2 don't always exist.

If i had been thinking properly I would not have done this for you. I would have done a similar question and let you work this one out by yourself.
Arn't you lucky.

If you are keen, why don't you do this question for me.
factorise -2x ² + 8x + 10
Hint: The first thing that you should factorise out is -2

MelodyJan 10, 2014

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On a graph on paper, start at the origin ((0,0) where the axis lines intercept) and go down 3. Put a point there. From that point, go up one and left one. Put a point there. Continue this if you want. Connect the points and you have a line!

GuestJan 10, 2014

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cube of 3= 3x3x3
3x3=9
9x3=27

GuestJan 10, 2014

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It should not be c. or d. because in a system of equations there should only be one ordered pair.
I got (1.66, -6.66), so it might be b.
work:
y= -x - 5
-x -5= 2x2 - 4x - 4
3x=5
x=1.66
y= -(1.66) - 5
y= -6.66
(1.66, -6.66)

GuestJan 10, 2014

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you can divide 15 15/15 is 1 and 75/15 is 5
so it equals 1/5

bobJan 10, 2014

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adam:
2x + 3 = 9

The aim is to get x on one side by itself.
Start with things that are 'tacked on' that is numbers that are just added or subtracted after the x term
here you have +3 how do you get rid of +3 well, you take it away.
That is you start by subtracting 3 from BOTH sides.
Then you will need to think about how to get rid of the 2 and do it to BOTH sides.
Then you will have your answer.

MelodyJan 10, 2014

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Already answered. Please don't post twice, I know it might have been an accident.

MelodyJan 10, 2014

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what is 1.35714286 as a fraction

There is a really good explanation on this web page
and there are some practice questions at the end.

Just copy and paste it into you browser.

http://www.mathsisfun.com/converting-decimals-fractions.html

Happy Calculations

MelodyJan 10, 2014

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4 2/3 +1 1/6 /1 1/4 + 1 7/8

5 5/6
---------
3 1/8

28/15
or 1 13/15

bobJan 10, 2014

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1. what is 976+959
2. what is 876-497
3.what is 678 times 32
4. 844532 times 99

1. 1935
2. 379
3. 21696
4. 83608668
is this suppose to be hard
Dude I'm in geometry and in 8th grade

bobJan 10, 2014

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helpneeded105:
Mr. Baldwin is walking to a friend's house. He walks 20.75 meters north, then realizes he walked too far. He turns around and walks 20.25 meters south. the entire walk takes him 12 minutes. What was his speed in meters per second?

how is the equation set up when using two distances?

Ok, first solve the equation d=rt for the rate (r) - r=d/t
Now, it doesn't matter if you have two different directions because you're only measuring speed, which doesn't rely on direction. So just add the 20.75 and 20.25 together.
20.25+20.75=41 meters
Now you need to solve for the time to make it into seconds instead of minutes, so just multiply 12 by 60 because there are 60 sec in 1 minute.
that gives you 720 seconds.
now just plug in the numbers.
r=d/t - 41m/720s

GuestJan 10, 2014

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d/7=14 original
d*1/7=14 same as original
*7 *7 Inverse of 1/7
d=91

bobJan 10, 2014

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what is it suppose to =??

it would be 28/3 though

bobJan 10, 2014

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4 >_>
Stop posting troll questions.

GuestJan 10, 2014

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harriet best:
9(n+3)+7(n+6)=

I'll just give you a hint:

5(x+3) = 5*x + 5*3 = 5x+15
You have to expand the 2 brackets separately and then simplify the answer

MelodyJan 10, 2014

Jan 9, 2014

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aaaaa:
sin (∞)=?

Undefined,
If you know what the graph looks like, just think about that.

MelodyJan 9, 2014

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JESUS MORETTI:
CUAL ES LA FORMULA PARA CALCULAR MONTO MENSUALIDADES DE UN PRESTAMO 20 AÑOSA UN INTERES FIJO_

WHAT IS THE FORMULA TO CALCULATE MONTHLY AMOUNT OF A LOAN INTEREST AN AGED 20 FIJO_
Hi Jesus,
I don't understand what the question is.
could you try to write it a different way please.
You probably need to give more information as well.

Hola Jesús,
No entiendo cuál es la pregunta.
podría tratar de escribir de una manera diferente por favor.
Es probable que tenga que dar más información también.

MelodyJan 9, 2014

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not a math person:
what is the third significant number of 21.3628300444

the first significant figure is 2
the second significant figure is 1
the third significant figure is 3

If you wanted to round it of to 3 significant figures, you would use the 4th one for rounding.
so if the 4th one is 5 or bigger, the 3 rd on goes up.
So
correct to 3 significant figures this is 21.4

MelodyJan 9, 2014

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Somehow the answer turned out to be A/B: A= 9*3^(2/3) and B=16. I still don't know how they got that and I keep getting something crazy.

ItscomPlicatedJan 9, 2014

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how do you turn a decimal to a fraction?

hi yummienae,

There is a really good explanation on this web page
and there are some practice questions at the end.

Just copy and paste it into you browser.

http://www.mathsisfun.com/converting-decimals-fractions.html

Happy Calculations

MelodyJan 9, 2014

+46

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Postby Serjio » Thu Jan 09, 2014 2:25 pm
What do you mean?

Hi Serjio. He is just a vile twerp whos brain is smaller than his wewe.

PuzzledJan 9, 2014

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The areas of these yards will be measured in metres squared (or square metres) m2
a) I want you to tell me the area of each of the yards separately
then
b) I want you to tell me the area of both the yards put together.

You can do this a few different ways. How many ways can you think of ?

So I want the answers but I want to know how you got the answers. More than one method would be good

Big yard is 5*4 = 20 square meters
small yard is 3*5 = 15 square meters

15 + 20 square meters is 35 square meters total

or

(5+7)*5 = 35 square meters total

I thougt meters squared was different than square meters
because if it was 35 meters square then it would be 35*35 = 1225 square meters

PuzzledJan 9, 2014

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