Answer:
I think it is 710
Step-by-step explanation:
Either 36,8 × 2,1 or 2,3 × 33,6
42
4+6 = 10
10+7 = 17
17+2 = 19
19+9 = 28
28+2 = 30
30+9 = 39
39+3 = 42