How can you break a table into two part

Which expression is rational? 6. , square root two, square root 14, square root 49

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.