On a math test a student, Sarah, has to identify all the coefficients and constants of the expression 9n+b+2. Sarah says that 9 is a coefficient and 2 is a constant. Identify all the coefficients and constants of the expression. What error might Sarah have made? The coefficient(s) of the expression is/are
(Use a comma to separate answers as needed.)

Fiona joins a fruit of the month club. the entry cost was $25 and then she pays $18 per month. if she participates for 8 months, how much will she pay in all? how much in 10 months?

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

What is the slope of the line that contains the points (-2,1) and (0,-3)