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i) The order of matrix is 2 ×3

ii)The order of matrix is 3×3

3)A square matrix in which each diagonal element is unit ,all other element being zero is called a unit matrix. for example ..Unit matrix is given in figure.. 4 )(1 +tan^2A).cos^2A=1 next step sec^2A×cos^2A next step 1 i.e (1+tan^2A=sec^2A) and (sec^2×cos^2A=1)

Estimated time = 5 hours

Actual time = 16 hours

16 = what percent of the estimated time

16 = (x/100)5

1600/5 = x

320 = x

The amount of time took to finish the project is 320% of the estimated time.

Step-by-step explanation: