Solve the system of equations by creating a matrix to represent the system of equations and transforming The matrix to reduced row echelon form

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

Measure of angles 31 (x+4) (3x+9) me

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible