Which value is equivalent to 4.5% written as a decimal?

a.
0.45

b.
45.0

c.
0.045

d.
4.5

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?