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
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Answer:
8x²+34; 45.52
Step-by-step explanation:
The top and bottom are both 2x²+8. The left and right are both 2x²+9
The total perimeter (top + bottom + right + left) = 2x²+8 + 2x²+9 + 2x²+8 + 2x²+9 = 8×x² + 34.
If x=1.2 then perimeter = 8 × (1.2)² + 34 = 45.52
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