Which is equivalent to 5 square root 1,215x

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -4

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76