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What's the difference between: x≥0 and nonnegative integer. ?

Brent works part-time at a clothing store. he earns an hourly wage of $15. if he needs to earn more than $45 in a day and works for x hours a day, which inequality represents this situation? a. 15x > 45 b. 15x < 60 c. x > 60 d. 15x < 45 e. x < 60

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal