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A radioactive substance has an initial mass of 100 grams and its mass halves every 4 years.  Which expression shows the number of grams remaining after t years?

Last year, the total revenue for Home Style, a national restaurant chain, increased 5.25% over the previous year.  If this trend were to continue, which expression could the company's chief financial officer use to approximate their monthly percent increase in revenue?  [Let m represent months.]

A payday loan company makes loans between $100 and $1000 available to customers.  Every 14 days, customers are charged 30% interest with compounding.  In 2013, Remi took out a $300 payday loan.  Which expression can be used to calculate the amount she would owe, in dollars, after one year if she did not make payments?