Which statement about the slope is true

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

Anyone know? will mark brainliest if correct

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)