10. Not sure what the question is. Looks like it could be to write 9/5 in decimal form? In that case, we have 1/5 = 0.2, so 9/5 = 9*0.2 = 1.8
11. [tex]52.\overline{23}=52.232323\ldots[/tex]. If we round to 5 decimal places, the approximate value is 52.23232
12. By long division, we can show that [tex]\dfrac{4.3}9=0.4777\ldots[/tex]. In repeated decimal notation, that's [tex]0.4\overline7[/tex]
