Easy question!!

how can i do this! need step by step explanation.

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Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression