The Clark family has a hallway that perimeter is 10and4/10 then they add that shortens the length of hallway what is the new perimeter? A. 3 3/10 B. 6 6/10 C. 9 2/10 D. 9 8/10

The correct answer is option (c) 9 2/10

Step-by-step explanation:

Perimeter 1 = 10

perimeter 2 = 4/10

new perimeter = perimeter 1 - 2 * perimeter 2

= 10 - 2 * (4/10)

= 10-8/10

= 100-8/10

= 92/10

= 9 2/10

C. 9 2/10

Step-by-step explanation:

Because it measures 10. And we cut 4/10 in length, therefore, this value is decreased twice so that it remains a rectangle.

Then it would be:

10 - 2 * (4/10) = 10 - 8/10 = 9.2

And this 9.2 we can express it as a mixed number as follows:

9.2 = 9 2/10

If we check, we know that 2/10 = 0.2 that added to 9, would be equal to 9.2