What is x in this equation 3[x+4]=3x+4

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Hello, i need compare km^2 and km. what's difference in this?

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.