Find the determinant of the matrix Q.

Can someone me and do the problem plz so i can understand it more better

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)