Respuesta :

Answer:

51.8

Step-by-step explanation:

20+18.2=38.2

90-38.2=51.8

Answer:

8.3

Step-by-step explanation:

(20)²=(18.2)²+x²

400=331.24+x²

400-331.24=x²

68.76=x²

√68.76=x

8.3=x