Respuesta :
Do you want it to 1 significant figure? If so, then:
458 = 500
1999 = 2000
12307 = 10000
500 + 2000 + 10000
= 12500
Hope my answer helped :)
458 = 500
1999 = 2000
12307 = 10000
500 + 2000 + 10000
= 12500
Hope my answer helped :)