Question

Find the mean proportion of the following: 81 and 121,,, 100 and 256​

Answer 1

Answer:

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Answer 2

Answer:

81:a:121

=81:a::a:121

81/a=a/121

a2=81* 121

a2=92* 112

a2=(9*11)2

a2=992

a2==99

2 is square ok