The amount of money you spend if you started with $40 and now has a d dollars

Eileen purchased 3.4 pounds of apples at the total cost of $19.72. if she purchases 6.2 pounds of apples at this store, how much would it cost?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

The expression 1.01*1.005(^t) gives the amount of money, in thousands of dollars, in carter's savings account (t) years after he opens it. what does 1.01 represent in this expression?