Question 1: verify that parallelogram abcd with vertices a(-5,-1), b(-9,6), c(-1,5), and d(3,-2) is a rhombus by showing that it is a parallelogram with perpendicular diagonals.

question 2 and 3 are down below.

show all work. you.

i dont know

step-by-step explanation:

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b