143 (-21)
Which is the best estimate of -
-42
--28
28
42

Answer:
28
Step-by-step explanation:
according to your picture its a negative times a negative which is going to give you a positive so that leaves two I also know that 14*2 is 28 but you still need to do the fraction which is 9/90or 9/10 so the best estimate is 28
Sorry if that doesn't make since i hope it helps