Final answer:
Alex Brown's gross pay for working 30 hours at $10.00 per hour is $300. The multiplication of the hourly rate by the total hours worked gives the gross pay amount.
Step-by-step explanation:
To calculate Alex Brown's gross pay for working 30 hours last week at an hourly rate of $10.00, you simply multiply the number of hours worked by the hourly rate. The calculation looks like this: 30 hours * $10.00/hour = $300.
Alex's gross pay is therefore $300. Among the given options, the correct answer is A. $300.