She has .91 left.
4.21 minus 3.30 equals .91.
Check work:
4.21
3.30
-------
0.91
(1 minus 0 is 1, 2 gets turned into 12-3 and the 4 got turned to a 3. 12-3 is 9, and 3-3 is zero. Then you just carry down the decimal)
Hope this helps! :)
Answer:
0.91 Hours left
Explanation:
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