asyed322
contestada

I've tried to get the answer for this 13 times now (not joking), plzzz help: write a formula that represents the number of people in the nth row (pre-calc problem, I only need the formula)
I will report if sent a link

Ive tried to get the answer for this 13 times now not joking plzzz help write a formula that represents the number of people in the nth row precalc problem I on class=
Ive tried to get the answer for this 13 times now not joking plzzz help write a formula that represents the number of people in the nth row precalc problem I on class=

Respuesta :

mhanifa

Answer:

  • 2820 seats
  • aₙ = 3n + 9

Step-by-step explanation:

This is an AP with:

  • The first term a₁ = 12
  • Common difference d = 3
  • Number of terms n = 40

Number of the seats:

  • Sₙ = 1/2*n(a₁ + aₙ) = 1/2n(2a₁ + (n - 1)d)
  • S₄₀ = 1/2*40(12*2 + 39*3) = 2820 seats

Formula of nth term:

  • aₙ = a₁ + (n - 1)d
  • aₙ = 12 + (n - 1)*3 = 12 + 3n - 3 = 3n + 9
  • aₙ = 3n + 9

Otras preguntas