Working together, melissa and jing can mow a lawn in 5 hours. it would take melissa 8 hours to do the job alone.

what is the value of r, the part of the lawn that jing could complete in 1 hour?

0.075
0.125
0.375
0.625

you need to show us the graph.

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