What shows a fractional and decimal equivalent of 9/20

Match each expression with its simplified form.

Which is the standard form for this number? (4 x 1 100 ) + (8 x 1 1,000 ) + ( 3 x 1 100,000 ) ? a) 0.004803 b) 0.04803 c) 0.0483 d) 0.483

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u