cadarii

(1) if the second and fourth term of a G.P are 8 and 32 respectively,what is the first term? (i need a practical solution please.) (2)the eleventh term of an A.P is 25 and its term is 3 find common difference? (also need practical solution.) (3)given the...

(1) evaluate 8 1/3 x 64 1/3 / 27 1/3? (2)if(X4/3 Y1/3)x(X1/2 Y-1/4) XrYt,find r-2t.