Alibrary changes a late return fee of $3.50 plus $0.15 per day that a book is returned late. write an equation to find the total late fee f for any number of days late d.

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?