Abook is in the shape of a right rectangular prism.
it measures 812 in. tall, 7 in. wide, and 2/12 inches thick.
what is the volume of the book?

Alright so to find the area of a rectangular prism (a book is a rectangular prism) you need to multiply the 3 numbers they give you so you multiply 7, 812, and 2/12. after you multiply all of the numbers you add ^3 to the end because you found the volume, its not a flat shape or a 2D shape.  

Cwill be your correct answer

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2