Aline that includes the points (-4, -7) and (n, -9) has a slope of -1. what is the value of n?

Which of the following contains a variable?

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?