Which of the following statements are true? (i) a nonhomogeneous system of 7 equations in 6 unknowns always has a unique solu tion (ii) if a and b are row equivalent then their row spaces are the same. (iii) if a 7 × 9 matrix has 7 pivot columns then nul a=r2 a. i only b. ii only c. iii only d. ii and ii only e. i, ii, and iii

matrix of mxn multiplied by another of nxp gives a matrix of mxp. the product does not have to be a square matrix. for example, a(4,2)*b(2,6) => ab (4,6), a rectangular matrix with 4 rows and 6 columns.

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

answer: on graphs, the open and closed circles, or vertical asymptotes drawn as dashed lines us identify discontinuities.

as before, graphs and tables allow us to estimate at best.

when working with formulas, getting zero in the denominator indicates a point of discontinuity.

when working with piecewise-defined functions, check for discontinuities at the transition points where one piece ends and the next begins.

step-by-step explanation: