Find the circumference of each circle. Round to the nearest tenth 4.5

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

How do i do this? i don’t understand

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.