Can someone PLEASE help with this and dont forget the step by step solution i wanna LEARN how to do it

What is the value of x in the diagram below?

Why do interests rates on loans to be lower in a weak economy than in a strong one

Phyllis and chen are saving money to go to a football game. each friend starts with some money and saves a specific amount each week. phyllis made a graph to show the total she has saved at the end of each week. chen wrote an equation to show the total, y, he has saved at the end of each week, x. y = 15x + 15 compare the amount that each friend has when both friends start saving. select the correct answer from the drop-down menu to complete the statement. phyllis starts with $ and chen starts with $