A rectangle with a length of 20 centimeters and an unknown width of x centimeters has a smaller rectangle cut out of it. The smaller rectangle has a length of 16 cm and a width of x-3. The area of the shaded region (what remains) is 80 square centimeters. Set up and solve an equation for the value of x. 20 cm 16 cm x-3

Q: Refer to image

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.