Question

Sydney is cutting the crust from the edges of her sandwich. The dimensions, in centimeters, of the sandwich is shown.

A rectangle labeled sandwich. The right side is labeled 2 x squared + 9. The bottom side is labeled 2 x squared + 8.
Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?

8x2 + 34; 43.6 centimeters
8x2 + 34; 45.52 centimeters
4x2 + 17; 21.8 centimeters
4x2 + 17; 22.76 centimeters

Answer 1

The Answer is: B 8x^2 + 34; 45.52 centimeters

Explanation:

Took it on edg

Answer 2

8x^2 + 34; 45.52 centimeters

Explanation:

The perimeter is twice the sum of adjacent edges of a rectangle:

P = 2((2x^2 +9) +(2x^2 +8)) = 2(4x^2 +17)

P = 8x^2 +34

Then when x=1.2, the perimeter is ...

P = 8(1.2^2) +34 = 8·1.44 +34 = 45.52 . . . . cm