Whats the answer and whats the value of each character? please help

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

Answer this 30 points and brainliest!

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?