How to use the reduced row echelon form(rref) to solve this system of equations without using the calculator?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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

Joey is asked to name a quadrilateral that is also a rhombus and has 2 pairs of parallel sides.should be his answer