Quick Series and Sequences question? (1 Viewer)

[Zokunu]

Littlehelp with question 1 and 10A ?

StepbyStep or any working out would be nice. TY

 

[HeroicPandas]

T_n represents the nth term of this sequence

So the first (1th) term is T₁
So the second (2th) term is T₂
So the third (3th) term is T₃

Therefore let n = 1, 2, 3 to find the first, second and third term respectively

 

[braintic]

Q10a

a + (a+d) = 10

(a+4d) + (a+7d) = 51

Solve simultaneously for a and d.

Then use these values to evaluate a + (a+7d).

 

[think]

For 10 a I got 34.6, working is attached but it is messy.
Basically you need to get two simultaneous equations using Tn and Sn formula for an AP. Then find a and d and then solve for T8 plus T1 or a.

Edit: same as above

 

[Carrotsticks]

I am curious, from where did you acquire such a worksheet?

It looks like it's been made in TeX, and few schools do that...

 

[Drongoski]

34.6 should be correct (but what painful choice of values!).

 

[Zokunu]

I am curious, from where did you acquire such a worksheet?

It looks like it's been made in TeX, and few schools do that...

TY all . And carrot I got the sheet that from my tutor "Focus College".

I got another question related to SAS. Littlehelp?

The numbers 3,x,y are in arithmetic progression and x,y,25 are in geometric progression. Find x and y. TY.

 

[braintic]

TY all . And carrot I got the sheet that from my tutor "Focus College".

I got another question related to SAS. Littlehelp?

The numbers 3,x,y are in arithmetic progression and x,y,25 are in geometric progression. Find x and y. TY.

x-3 = y-x
2x = y+3

y/x = 25/y
y^2 = 25x

Then solve simultaneously.