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.

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

this is a very good question

step-by-step explanation:

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