Respuesta :

83) 2.5
25 ÷ 10 = 2.5

84) 7 mm = 0.7 cm
7 cm = 0.07 m
7000 m = 7 km
83 is 2.5 because using proportions...
25/10
x/1
So basically 25/10. 2.5 or in fraction form 5/2