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Here is a simple little site that I like.

Put the numbers in and it will spit our your answer.

Firstly, this is not really the sum of 1 sequence, it is the sum of 2 sequences

\(1^2+3^2+5^2+ .......\\ 2.5^2+2.7^2+2.9^2......\\ S_{20}=1^2+3^2+5^2+ .......+19^2\quad+ \quad 2.5^2+2.7^2+2.9^2......+4.3^2\)

I suppose I could just calculate the answer.

\(S_{20}=1330+118.9 = 1448.9\\ A=1448.9/20=72.445\)

Doesn't look like any of those answers to me.

Let the common ration be \(x\).

So no. of marbles

Kaden gave away = 2\(x\)

Adam gave = 4\(x\)

John gave = 9\(x\)

Now, no. of marbles

Kaden has = 2\(x\) + 2

Adam has = 2(2\(x\) + 2) 

                     = 4\(x\) + 4

John has = 2(4\(x\) + 4) 

                   = 8\(x\) + 8 

 

2\(x\) + 2 + 4\(x\) + 4 + 8\(x\) + 8 = 56

14\(x\) + 14 = 56

14\(x\) = 42

\(x\) = 3

 

Thus John gave away 9*3 = 27 marbles. 

:) thank you!

Well you have your answer :)

Thanks Hannah,

You didn't forget Cal,  Now you have given me 2 cakes.  Just as well that they are virtual :)

Yes, yes it does

Does 71+71+38 = 180?

3,   -6,   12,   4,   20

  -9   +18   -8   +16

you can see the pattern from here.

so, 20 - 7 = 13

Sorry I'm not good at this!

I wish I could help!

By the way, Become a member!!

~Hannah🌹🌹🌹

Good job, catmg!!!

Thank you! 
 

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The beautiful thing about learning is that no one can take it away from you. ~ Hannah🌹🌹🌹

Don't know much about this, but here's my best shot. On the z score table, 40% corresponds roughly with a z-score of ... z score = score - mean. ______. std deviation ... 50 (.25) = score - 400 add 400 to both sides ... 412.5 = score ≈ 413.

The beautiful thing about learning is that no one can take it away from you. ~ Hannah🌹🌹🌹

q = 28º

r = 32º

s = 78º

t = 118º

u = 50º

"N mod 3  =  2          ⇒  3a + 2  =  N

N mod 4  =  1         ⇒   4b + 1 =  N

3a - 4b +  1   =  0

3a  =   4b  -  1

a              b

5              4

9              7    ......

3(5)  + 2   =   17

4(4)  + 1   =   17

3(9)  + 2  =   29

4(7)  +  1  =  29

17 mod 12    =   5

29 mod 12  =    5  ......etc" WORDS FROM CPhill

Become a member!

The beautiful thing about learning is that no one can take it away from you. ~ Hannah🌹🌹🌹

Never mind I got it!

The beautiful thing about learning is that no one can take it away from you. ~ Hannah🌹🌹🌹

Oh my gosh

I can't believe I forgot

I modelled this on Blender specifically for Melody <3 It's not edible but... heh.... :p I still hope you enjoy.

4. a) since we know RT and TS are the same, we know that triangle RTS is an isosceles triangle, meaning angle RST is the same as TRS; being 32^o

    b) angle RTS is --> 180 - 32 - 32 = 116^o

    c) we know angle SPQ is 45^o, and now that we know angle QSP or RST is 32^o, we can find angle PQS. 
        180 - 45 - 32 = 103^o

5. a) angle DBC 72^o because of corresponding angles

    b) angle C is the same as angle DBC because it's an isosceles triangle. (72^o)

    c) angle CDB is 180 - 72 - 72 = 36^o

    d) angle DEB  is 180 - 90 - 36 = 54^o

    e) angle BEA is 36^o, and we know that because of alternate angles (equal to angle DBE)

    f) angle EBA is 180 - 36 - 72 = 72^o 

tell me if I did anything wrong :)

Tuesday, Sam and Peter went to a resturaunt to eat lunch.

After eating lunch, they paid the bill.

But Sam and Peter did not pay the bill.

So who did?

Tuesday paid the bill! 

The beautiful thing about learning is that no one can take it away from you. ~Hannah🌹🌹🌹