Determine whether the matrix is elementary. if it is, state the elementary row operation used to produce it. 1 0 0 0 −3 1 0 0 0 0 1 0 0 0 0 1 the matrix is elementary. it can be obtained from the identity matrix by interchanging two rows. the matrix is elementary. it can be obtained from the identity matrix by multiplying a row by a nonzero constant. the matrix is elementary. it can be obtained from the identity matrix by adding a multiple of a row to another row. the matrix is not elementary.

Plz, ! the box plot below shows the total amount of time, in minutes, the students of a class surf the internet every day: a box plot is shown.part a: list two pieces of information that are provided by the graph and one piece of information that is not provided by the graph. (4 points) part b: calculate the interquartile range of the data, and explain in a sentence or two what it represents. (4 points) part c: explain what affect, if any, there will be if an outlier is present. (2 points)

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?