Answer:
The best estimate for 43x78 is 40x80
Step-by-step explanation:
43 rounded to the nearest ten is 40.
78 rounded to the nearest ten is 80.
The answer to 40x80 is 3200
108, 15, 93
20
-5x^5 + 2x^3 - 6x should be your answer
Answer: There is no question so I don't know how to answer your question
