Answer:
0.0875 km²
Step-by-step explanation:
1km = 1000m
1km²=1000*1000=1000000m²
6500m²=6500/1000000 km²
= 0.0065 km²
total area= 0.0065+0.08=0.0875 km²
You can change the form of the number to scientific notation before or after you do the addition. Here, we see the sum will be less than 100 million tons, so we can convert to scientific notation before we do the addition without requiring extra steps. The total waste is the sum of the amounts of waste in the two years.
... 3.75×10⁷ + 3.04×10⁷ = (3.75 +3.04)×10⁷ = 6.79×10⁷ . . . tons
so it is 84 so what you do is multiply 7x4x3 and it will give you 84