Please help solve for n as well as the following questions that come once you find the right answer for n

How many grams must be adde to 970g to make 1 and a half kg

Which value of c would make he following expression completely factored? 8x+cy

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression