At midnight the temperature was -5 (degrees) by 10:00 a. m. the next morning it had increased by 17(degrees) what was the temperature at 10:00 a. m.

A.22(degrees)
B.12(degrees)
C.10(degrees)
D.8(degrees)

B 12 degrees

Step-by-step explanation:

-5 + 17 = 12

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