Question

a1=28, d= -3...... find a8

Answer 1

ok Formula ?

Answer 2

a n =a 1 +(n−1)d
a8=28+(8-1)-3

Answer 3

a8=28+(8-1)3

Answer 4

its a -3 though.....

Answer 5

oh ok sorry
a8=28+(8-1) x (-3)

Answer 6

where does the 'x' come from ? ? ??

Answer 7

a n =a 1 +(n−1)d

a n =a 1 +(n−1) x d

We multiplied it remember ?

Answer 8

oh i thought you meant the letter x

Answer 9

i just put that there to avoid confusion :)

Answer 10

so then it would be.... a8=28+(8-1) x (-3)
a8= 28=9*-3?

Answer 11

Yes
Now tell me what is 9*-3 ?

Answer 12

-27

Answer 13

Yes so 28+ (-27) =?

Answer 14

55?

Answer 15

1

Answer 16

Yes!

Answer 17

a8=1 ? ? ?

Answer 18

Yes!

Answer 19

a1=47, d=-5 , FIND a7

Answer 20

Try

Answer 21

a7=47+(7-1) x (-5) ????

Answer 22

yup

Answer 23

a7= 47+6*-5
47+-30=17
a7=17 ? ? ?

Answer 24

YESS you're doing great :D

Answer 25

How many more left?

Answer 26

9 :\

Answer 27

ok you can do it ,i'll check if its right!

Answer 28

ok a1=12 d=-7 FIND a12
a12=12+(12-1) x (-7)
a12=12+11*-7
a12=12+-77
a12= -65 ?

Answer 29

RIGHT :)

Next

Answer 30

a1=18 d=-9 FIND a13
a13=18+(13-1) x (-9)
a13=18+12*-9
a13= 18+-108
13= -90 ?

Answer 31

Right :D
Next

Answer 32

I NEED YOUR HELP ON THIS ONE !!!!!!!!!!
14,17,20,23,26,29..... FIND a13

Answer 33

ok the first number is a1

Answer 34

is it 50????

Answer 35

how?

Answer 36

you add 3 to get all of the shown numbers and i added 3 , 13 times and i had got 50

Answer 37

actually d is the common difference

so to find the common difference we find out d (subtract first number from second number)

so here a1 =14 d=17-14=3 so d=3

now how do you find a13?

Answer 38

Mammoth patience o.O Kudos.

Answer 39

Not sure... but i REALLY neeed help on the next ones...
t1=15, t2=21 t,20=?

Answer 40

Did you get the previous one ?

Answer 41

No

Answer 42

Wanna continue here?

Answer 43

she posted new question

Answer 44

Ah shes here

Answer 45

There? @jordan199 ?