Respuesta :

The sum is 18ft because 9in + 3in is 12in which is a foot. Then 12+1+5= 18ft
Billymkhoi
We already know that 1 ft= 12 in.

5 ft 9 in= 5 ft* (12 in/1 ft)+ 9 in= 69 in

12 ft 3 in= 12 ft* (12 in/1 ft)+ 3 in= 147 in

5 ft 9 in+ 12 ft 3 in= 69 in+ 147 in= 216 in

The final answer is 216 in.

Hope this would help~

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