The best way to estimate it is to do "written addition" in your head, adding 1+8, then 9+3, all the way until you get to the front. the actual answer is 189,459, so your answer should be somewhere close to that.
Answer:
It's C) 53
Step-by-step explanation:
1 is not a function. 2 is not. 3 is not. 4 and 5 are functions. 6 is not.
Look at it this way 1(700)*1(20). can u do it now?