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Verified answer
A. 5,10,20,40,...a = 5
r = 10/5 = 2
U7 = a x r^6 = 5 x 2^6 = 320
b. 729 ,243, 81, 27, ...
a = 729 = 3^6
r = 243/729 = ⅓
U10 = a x r^9 = 3^6 x (⅓)^9
U10 = 3^(6-9) = 3^(-3) = (⅓)³ = 1/27