Answer:
1810
640+30=670
1573-680=903
903+907=1810
0
Step-by-step explanation:
Plug in 4 for x
9(4) + 7 = 40
36 + 7 = 40
43 ≠ 40
No, 4 is not a solution
hope this helps
1:7
2 days = 2, 2 weeks = 14 days
2:14
u can divide it by 2
becomes 1:7