Ravi deposits $600 into an account that pays simple interest at a rate of 4% per year. how much interest will he be paid in the first 6 years?

Just find the interest paid after one year, and then multiply the result by 6 (years).  This gives you the amount of simple interest.

The easiest approach would be to use the formula  i = p r t.  In this case p = $600, r = 0.04, and t = 6 years.

Ibelieve the answer is b. y=0 would make the line horizontal across the x.