Which of the following subsets of m3(ℝ) are subspaces of m3(ℝ)? (note: m3(ℝ) is the vector space of all real 3 x 3 matrices) a. the invertible 3×3 matrices b. the 3×3 matrices with all zeros in the second row c. the diagonal 3×3 matrices d. the 3×3 matrices in reduced row-echelon form e. the 3×3 matrices whose entries are all integers f. the symmetric 3×3 matrices

part 1 answer = 8

part 2 answer = 72

step-by-step explanation:

part 1 explanation = add all of the numbers, then divide by how many numbers you have. so, 200/25 = 8.

part 2 explanation = not gonna lie, this is hard to explain, so just google how to do it.

.there can be infinite values of m and n that can satisfy the above equation. for each value of m of m or n. there maybe infinite sets of solution for the above

step-by-step explanation:

answer is  

c.

36

step-by-step explanation:

all of the measures need to be converted to the same measure; such as inches. if you do that it is easy to determine which is the longest, 2500 mm which is approximately 97.5 inches.