Which answer best describes the solution for x if – 3 < x + 4 ≤ 7? a. x > –7 b. x > –7 and x < 3 c. x ≥ –7 and x ≤ 3 d. x > –7 and x ≤ 3

The answer would be D. In order to solve this, you need to first get x by itself. To do this we would subtract both sides by 4. This would then give us our answer of -7< x  ≤ 3

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