For any number Z, Z* is defined as the greatest positive even integer less than or equal to y. What is the value of 6.45 – 6.45*?
Pick one:  A) 0.45  B) 0.5  C) 6.45  D) 0.25  E) 6.0
Since Z* is defined as the greatest positive even integer less than or equal to Z, then 6.45* =6 (the greatest positive even integer less than or equal to 6.45 is 6).   Hence, 6.45 – 6.45* = 6.45 - 6= 
<gadget id="calculator">6.45 - 6</gadget>
<output>0.45</output>
0.45   0.45nswer: 0.45.
<result>A</result>
For any number Z, Z* is defined as the greatest positive even integer less than or equal to y. What is the value of 6.45 – 6.45*?