Which of the following describes the correct process for solving the equation 2x − 4 = 20 and arrives at the correct solution?

add 4 to both sides, and then divide by 2. the solution is x = 12.
divide both sides by −4, and then subtract 2. the solution is x = −7.
subtract 4 from both sides, and then divide by 2. the solution is x = −12.
multiply both sides by −4, and then divide by 2. the solution is x = −40.

Part a what is the area of triangle i? show your calculation. part b triangles i and ii are congruent (of the same size and shape). what is the total area of triangles i and ii? show your calculation. part c what is the area of rectangle i? show your calculation. part d what is the area of rectangle ii? show your calculation. part e rectangles i and iii have the same size and shape. what is the total area of rectangles i and iii? show your calculation. part f what is the total area of all the rectangles? show your calculation. part g what areas do you need to know to find the surface area of the prism? part h what is the surface area of the prism? show your calculation. part i read this statement: “if you multiply the area of one rectangle in the figure by 3, you’ll get the total area of the rectangles.” is this statement true or false? why? part j read this statement: “if you multiply the area of one triangle in the figure by 2, you’ll get the total area of the triangles.” is this statement true or false? why?

Simply 8x squared + 5(7x squared- x) - 2x =

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?