Answer:
68
Step-by-step explanation:
[tex]a_2=2a_1+4=2\cdot 5+4=14\\\\a_3=2a_2+4=2\cdot 14+4=32\\\\a_4=2\cdot 32+4=68[/tex]
a₄ = 68
_____
The explicit formula is
an = 9·2^(n-1) -4
