Arectangle is 9 feet long and 40 inches wide what is the area in a square foot

To find the area of a rectangle, you multiply the length times the width. Since there are two units of measurements being used, you have to convert one of them so that the two values have the same units. Since the question asks for square feet, you need to convert 40 inches into # feet

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40 in = 3.33 feet (aka 10/3 feet)

Now that both the length and width of the rectangle have the correct unit of measurement, you can multiply them together to find the area:
area = 3.33 ft · 9 ft 
area = 29. 97 ft