The interface provides a text box for the user to enter the number of shirts being laundered.You want to make sure a string typed in by the user can be converted to a number to be used in the calculation for the total.Which of the following statements is valid? 
Definitions:
Pain
An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage.
Screening Tests
Medical tests or examinations used to detect diseases or conditions in people who do not yet have any symptoms.
Preventive Care
Healthcare services that focus on disease prevention and health maintenance to avoid future health issues.
Mental Health
A state of well-being in which an individual realizes their own abilities, can cope with the normal stresses of life, can work productively, and is able to make a contribution to their community.
Q3: Alkanes have the general formula<br>A)C<sub>n</sub>H<sub>2n-4</sub><br>B)C<sub>n</sub>H<sub>2n-2</sub><br>C)C<sub>n</sub>H<sub>2n</sub><br>D)C<sub>n</sub>H<sub>2n+2</sub><br>E)C<sub>n</sub>H<sub>2n+4</sub>
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