Answer:
262144
Step-by-step explanation:
Geometric sequence : -1 , 4 , -16 , 64 .....
Ratio = 2nd term ÷ 1st term = 4 ÷ (-1)= -4
a = first term = -1
r = -4
Each term is obtained by multiplying the previous term by (-4)
nth term = [tex]ar^{n-1}[/tex]
10th term = [tex](-1) * (-4)^{9}= -1 * (-262144) = 262144[/tex]
