Math question - help due today

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Asystem of linear equations contains two equations with the same slope. select all of the correct statements. i a. the system may have two solutions. - b. the system may have infinitely many solutions. c. the system may have one solution. o d. the system may have no solution. submit

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9