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Answer:
A- The number of rose plants in first, second third,..., and last row are respectively.
23,21,19,....,5.
Let the number of rows of rose plants n.
The sequence 23,21,19,....,5 is an A.P. with first term a(=23), common difference d(=−2) and n
th
term (=5).
∴a
n
=a+(n−1)d
⟹5=23+(n−1)×−2
⟹5=23−2n+2⟹20=2n⟹n=10
Hence, there are 10 rows of rose plants.
B- Describing Matrices in terms of rows and columns, dimensions (or order) of a ... A matrix consists of a set of numbers arranged in rows and columns. A matrix (whose plural is matrices) is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns. A matrix with m rows and n columns is called an m×n m × n matrix or m -by-n matrix, where m and n are called the matrix dimensions.