the average marks of rashid in first four papers is 88 .how much marks should he get in fith paper so that the average of his five papers becomes 90

98

Step-by-step explanation:

Average of current papers is:

 x 100 = 88

Therefore solve: x 100 = 90

x 100 = 90

352 + x = 450

x = 98

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

ok then what happened.