Question

ASAP plz Just the answer

A child is creating a pyramid with building blocks. The top three levels include 5 blocks, 12 blocks, and 19 blocks.

Part 1: How many blocks would be needed for a pyramid 25 levels tall? (5 points)

Part 2: Use complete sentences to explain how a sum of an arithmetic series was applied.

Answer 1

@Jim766 plz help

Answer 2

@kausarsalley help

Answer 3

sequence and series

Answer 4

good i got it without even reading the b

Answer 5

medal to correct answer

Answer 6

the terms are 5,12,19

and the common difference is 7

Answer 7

can i have the formula for arithmetic progression

Answer 8

i dont know

Answer 9

\[a_n=a_1+(n-1)d\]

Answer 10

ok whats the answer plz

Answer 11

plz asap

Answer 12

need this

Answer 13

OOK GIVE ME A MINUTE

Answer 14

http://openstudy.com/study#/updates/5016a4e9e4b04dfc808ac361

Answer 15

there you go buddy.

Answer 16

no that different numbers

Answer 17

come on i need this plz ASAP

Answer 18

did you see the solution

\[f(1)=5\]

Answer 19

f(3)=12+7

Answer 20

“You see, in this world there’s two kinds of people, my friend: Those with loaded guns, and those who dig. You dig.”

Answer 21

what?

Answer 22

f(25)=19+(22*7)=

Answer 23

i think that should give you the answer @pvs285

Answer 24

i am not sure i just looked up what the other guy did

Answer 25

dont worry @pvs285 i think @Luis_Rivera was talking to me

Answer 26

i need that answer

Answer 27

@satellite73 Help

Answer 28

173 buddy may be you shuld attempt the algebra

Answer 29

but part 2

Answer 30

part 2 help

Answer 31

@Jim766 help

Answer 32

f(1)=5

f(n)=f(n-1)+d

Answer 33

complete sentences

Answer 34

thanks

Answer 35

in maths formulas are sentences

Answer 36

come on really

Answer 37

@christianfilms11 come on

Answer 38

I am sorry! that's all I got :'(

Answer 39

jim help

Answer 40

Arithmetic seq
An = a1 + (n-1)d formual for arth seq
A25 = a1 + (25-1)(-7) 25 rows, comm dif = -7
5 = a1 + (24)(-7)
5 = a1 + -168
173 = a1 the bottom row in the pyrimid would have 173

They tell you that the top 3 rows have 5, 12, 19
That means top row , A25, has 5

Answer 41

Need to do this to find A1

Sum of arith seq is

\[sn = \frac{ n(a1 + an) }{ 2 }\]

n is the number of rows 25
A1 is 1st row 173
An is 25th row 5