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The width of a rectangle measures 
(3.7 f+3.9 g) centimeters, and its length measures 
(3.5 f+8.2 g) centimeters. Which expression represents the perimeter, in centimeters, of the rectangle?

7.2 f+12.1

14.4 f+24.2

14.4 f+24.2 g

14.4 f+16.4 g+3.9

The width of a rectangle measures (3.7f+3.9g) (3.7 f+3.9 g) centimeters, and its length measures (3.5f+8.2g) (3.5 f+8.2 g) centimeters. Which expression represents the perimeter, in centimeters, of the rectangle?\newline7.2f+12.1 7.2 f+12.1 \newline14.4f+24.2 14.4 f+24.2 \newline14.4f+24.2g 14.4 f+24.2 g \newline14.4f+16.4g+3.9 14.4 f+16.4 g+3.9

Full solution

Q. The width of a rectangle measures (3.7f+3.9g) (3.7 f+3.9 g) centimeters, and its length measures (3.5f+8.2g) (3.5 f+8.2 g) centimeters. Which expression represents the perimeter, in centimeters, of the rectangle?\newline7.2f+12.1 7.2 f+12.1 \newline14.4f+24.2 14.4 f+24.2 \newline14.4f+24.2g 14.4 f+24.2 g \newline14.4f+16.4g+3.9 14.4 f+16.4 g+3.9
  1. Perimeter Formula: To find the perimeter of a rectangle, we need to add up all the sides of the rectangle. The formula for the perimeter PP of a rectangle is P=2×(width+length)P = 2 \times (\text{width} + \text{length}).
  2. Expressions for Width and Length: First, let's write down the expressions for the width and the length of the rectangle:\newlineWidth W=(3.7f+3.9g)W = (3.7 f + 3.9 g) cm\newlineLength L=(3.5f+8.2g)L = (3.5 f + 8.2 g) cm
  3. Apply Perimeter Formula: Now, we will apply the formula for the perimeter using the given expressions for width and length:\newlineP=2×((3.7f+3.9g)+(3.5f+8.2g))P = 2 \times ((3.7 f + 3.9 g) + (3.5 f + 8.2 g))
  4. Combine Like Terms: Next, we combine like terms inside the parentheses:\newlineP=2×((3.7f+3.5f)+(3.9g+8.2g))P = 2 \times ((3.7 f + 3.5 f) + (3.9 g + 8.2 g))\newlineP=2×(7.2f+12.1g)P = 2 \times (7.2 f + 12.1 g)
  5. Multiply by 22: Finally, we multiply each term inside the parentheses by 22 to find the perimeter:\newlineP=2×7.2f+2×12.1gP = 2 \times 7.2 f + 2 \times 12.1 g\newlineP=14.4f+24.2gP = 14.4 f + 24.2 g

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