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3 March, 06:06

Alexi wants to hang a mirror in his boat and put a frame around it. The mirror and frame must have an area at 19.25 square feet. The mirror is 3 feet wide and 5 feet long. Which quadratic equation can be used to determine the thickness of the frame, x.

1. 2x^2+8x-19.25 = 0

2. 3x^2+5x-19.25 = 0

3. 4x^2+16x-4.25 = 0

4. 4x^2+16x+15 = 0

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Answers (1)
  1. 3 March, 09:30
    0
    Given:

    area of mirror and frame : 19.25 square ft.

    dimensions of the mirror: length = 5ft; width = 3ft

    area of mirror = 5 ft * 3 ft = 15 square feet.

    area of frame = 19.25 square feet - 15 square feet = 4.25 square feet.

    I think the correct answer is 3.) 4x² + 16x - 4.25
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