Answer :

adeletedaccount

start with a_1 = 7

a_2 = a_1 + 4 = 7 + 4 = 11

a_3 = a_2 + 4 = 11 + 4 = 15

a_4 = a_3 + 4 = 15 + 4 = 19

so, a_4 = 19

Answer:

a(4)= 19

Step-by-step explanation:

check the diagram for better explanation.

a(4)= a(4-1) +4

a(4) = a3 + 4

a(3) = a2 + 4

a(2) = a1 +4

a1 = 7(Given)

a2 = 7+4 = 11

a3 = 11+4= 15

a4 = 15+4 = 19.

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