Question

If 3 , z, 81 are in G. P, then y = ?

Answer 1

Hey there !

If a, b, c are in G. P then b² = a*c .

So ,

If 3 , z , 81 are in G. P then,

z² = 81 * 3

z² = 3³*3

z² = 3^4

z = 3^4/2

z = 3²

z = 9 .

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Proof : if a, b, c are in G. P

then, b = ar , c = ar²

b² = ( ar) ² = a²r² = a (ar²) = ac

Answer 2

here is no "y"
but z is the variable...
if they r in G.P. then...
81/z =z/3
z = √81*3
z = √243
z=15.588

hope this helps..... if correct..

please mark as brainlist