How do you know when to factor a difference of squares versus a difference of cubes?

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 $

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"