Need help with multiple choice question

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

Your client has saved $1,860 for a down payment on a house. a government loan program requires a down payment equal to 3% of the loan amount. what is the largest loan amount that your client could receive with this program

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?