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a= 30degrees, because from the image a and 30 are vertically opposite angles .And vertical opposite angles are equal

because c and 75 are angles on a straight line and angles on a straight line sum up to 180.

Therefore

b+a+90=180degrees. Because they are the interior angles of a triangle. But a=30.Therefore

Group like terms

Therefore b=60degrees

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

70

step-by-step explanation: