Question

._.

Answer 1

bs dis is arithmtic progrsson

Answer 2

u knoe formula of ap
a_n = a_1 + (n-1)d

Answer 3

i don't think i learned that??

Answer 4

it s incrzing by 6 evry lvl

Answer 5

ok, i know that formula

Answer 6

so a_25 = 4 + (25 - 1)6?

Answer 7

u need sum of arthmtic progrssion

Answer 8

148??

Answer 9

S = n/2(2a1 + (n-1)d)

Answer 10

use n=30,a1 = 4 and d=6 in d abv formula i gave

Answer 11

why does n = 30??

Answer 12

srry, n=25

Answer 13

i used that formula and got 1900

Answer 14

y did u use dat formula

Answer 15

this formula S = n/2(2a1 + (n-1)d)

because that's the arithmetic series formula??

Answer 16

rite ans!!!

Answer 17

but?? the answer isn't 1900???

Answer 18

1300 ?

Answer 19

i'm so confused T-T

Answer 20

is the answer 1300 though?

Answer 21

i don't think so?? maybe?? seems a bit much for kid's building blocks??

Answer 22

wait no. calculation mistake. it should be 1900.

Answer 23

it's 148. i just did it manually with the calculator; adding 6 25 times...

Answer 24

so this is the formula i would use??

a_n = a_1 + (n-1)d
??

Answer 25

nope.. 1850.. calculation mistake again.
nah you cant do that..
the first level has 4, then 10, then 16, then 22..
so you gotts add 4+10+16+22.... so on.

Answer 26

yeah calculate an.. 148?

Answer 27

wtf do i do omg

Answer 28

a_n = a_1 + (n-1)d
a_25 = 4 + (25 - 1)6
a_25 = 4 + 24(6)
a _25 = 4 + 144
a_25 = 148

Answer 29

but is that the right formula??

Answer 30

or is that just telling me there's 148 blocks on level 25??

Answer 31

wtf.. 1900 is the answer.. i cant do simple multiplication. :/
yeah thats the right formula..

Answer 32

so the answer is 1900?

Answer 33

next you use S_n= n/2 [a1+ an]

Answer 34

n/2[2a1 + (n - 1)d]
25/2[2(4) + (25 - 1)6]
12.5[8 + 24(6)]
12.5(8 + 144)
12.5(152)
1900

this is correct?

Answer 35

yup.. looks right. i dont see any reason why 1900 shouldnt be correct.

Answer 36

so i had it correct this whole time lol. omg. thanks

Answer 37

its 1900

Answer 38

Ha. You're welcome.

Answer 39

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Answer 40

may i knoe when my medal will b delivered to my house??

Answer 41

you don't get an actual medal

Answer 42

den this website is fully fraud!!! they take advantage of sweet girls like me

Answer 43

Ha.. epic !