Show all the work as to how you got the answer. i really need the and how to show the work. you for your .

12)

A=LW  in this case:

A=10*4

A=40 ft^2  (40 square feet)

13)

Since when rounding to the nearest 100, it rounds to 400, the number must be greater than or equal to 350...

n≥350

When rounded to nearest 10, it rounds to 350, so n<355

350≤n<355

Only C., 352 can satisfy the inequality.