Answer
a) 400000
b) 390000
c) 386000
d) 3.8550 * $10^{5}$
Work Step by Step
Count out the expected significant figures and figure out whether to round up or down
a) Since 8 rounds up -> 400000
b) Since 5 rounds up -> 390000
c) Since 5 rounds up -> 386000
d) Since 0 rounds down -> 385500. However, since has 4 sig figs, we can convert this to scientific notation.
3.8550 * $10^{5}$
