6. Marcus is setting the corner supports for a new deck that measures 15 feet by 20 feet. To ensure that his deck is a be? perfect rectangle, he measures the diagonals to make sure they are the same. What length should these diagonals be

25 feet.

Step-by-step explanation:

Let x represent length of diagonal.

We have been given that Marcus is setting the corner supports for a new deck that measures 15 feet by 20 feet. We are asked to find the length of the diagonal such that Marcus's deck is a perfect rectangle.

We know that each angle of a rectangle is a right angle.

We will use Pythagoras theorem to find the length of diagonal as:

Upon taking positive square root of both sides, w e will get:

Therefore, the length of the diagonals should be 25 feet.

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17

b. 2 and 4

step-by-step explanation: