jessicannoh4763 jessicannoh4763
  • 23-10-2019
  • Mathematics
contestada

Consider a sequence that follows a minus 5 pattern: 30, 25, 20, 15, ….
b. Using the formula, find the 20th term of the sequence.

Respuesta :

carlos2112
carlos2112 carlos2112
  • 24-10-2019

Answer:

[tex]a_2_0=-65[/tex]

Step-by-step explanation:

As we can see, the sequence starts from 30 and decreases by 5 each time. So, one possible formula for that sequence could be:

[tex]a_n=35-5n\hspace{10}n\in N[/tex]

Let's confirm the formula by evaluating the first 4 terms:

[tex]a_1=35-5(1)=35-5=35\\a_2=35-5(2)=35-10=25\\a_3=35-5(3)=35-15=20\\a_4=35-5(4)=35-20=15[/tex]

Finally evaluating n=20:

[tex]a_2_0=35-5(20)=35-100=-65[/tex]

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