What is PERS-91?

What is the adverb in the sentence is not an adverb we measured the frame lengthwise and then fastened securely? What is a solid with several faces? Does 24 have 6 factors? Is a set of points in a coordinate plane the graph of a function if and only if no two points on the graph lie on the same horizontal line? How many times deos 2 go into 16? Is a meter bigger than millimeter? what quadrilateral Has diagonals of different lengths? What is 133 percent of 90? What does x-2 equal? What Three numbers multiply to get 216? Is 2 plus 3 equal to 3 plus 2 commutative property? Are there any animals over 25 pounds in weight with world populations of over 7 billion? Is 12 in integer? How many perpendicular faces has a cube got? Is 3 yards 51 ft? What represent a part of a whole? How many lines of symmetry does capital H have? What is the prime and composite number for 18? How many edges does a icosidodecahedron have? How many kilometer are there in 1600 meter?