1×1+2×(1/10)+4×(1/100)+3×(1/1000) in word form

One times one plus two times one over ten plus four times one over one hundred plus three times one over one thousand

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80