Please help me with my Algebra. :)

What is the size of the matrix resulting from

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

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?