1) -4, -8, -16, -32...
Recursive Formula: f(1)=-4, f(n) = 2*f(n-1)
Explicit Formula: f(n) = -2ⁿ where n>1
11th term = f(11) = -2¹²=-4096
2) 320, 80, 20, 5...
Recursive Formula: f(1)=320, f(n) =f(n-1)/4
Explicit Formula: f(n)=320/4ⁿ⁻¹
11th term = f(11) = 320/4¹⁰ =
3) 10, 40, 70, 100...
Recursive Formula: f(1)=10, f(n)=f(n-1)+30
Explicit Formula: f(n)=10+30(n-1)
11th term = f(11) = 10+30(10) = 310
4) 4, 7, 10, 13...
Recursive Formula: f(1)=4 and f(n)=f(n-1)+3
Explicit Formula: f(n)=4+3(n-1)
11th term = f(11) = 4+3(10)=34