smartiecaly smartiecaly
  • 20-07-2020
  • Mathematics
contestada

pls help asap it math

pls help asap it math class=

Respuesta :

dannielle
dannielle dannielle
  • 20-07-2020

Answer:

2133 bricks

Step-by-step explanation:

a27=1

a4=139

  a27=a4+23r

   1=139+23r

  23r=1-139

23r=-138

r=-138/23=-6

a4=a1+3r

139=a1-18

a1=139+18

a1=157

n=a1+......+a1+26*r=a1+a1+r+......+a1+26r=27*a1+r(1+2+...+26)

=27*157-6*26*27/2=4239-3*26*27=4239-2106=2133

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