Etermine which of the following subsets of R3×3 are subspaces of R3×3. 1. The singular 3×3 matrices 2. The 3×3 matrices whose entries are all integers 3. The symmetric 3×3 matrices 4. The 3×3 matrices with all zeros in the first row 5. The invertible 3×3 matrices 6. The 3×3 matrices with trace 0 (the trace of a matrix is the sum of its diagonal entries) 7. The upper triangular 3×3 matrices 8. The 3×3 matrices in reduced row-echelon form

seems like d

step-by-step explanation:

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.

answer: 180 degrees clockwise

step-by-step explanation: