Me . the top one is the one i need to solve is it a b or c or d

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Find the domain and range of the following function f(x) = 51x - 21+ 4

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?