Help me please! Dont answer if you dont know it, or dont tell me to look it up, i'm lazy okay?

Multiply and simplify. (x - 4) (x^2 – 5x – 6) i will mark brainliest if your answer is right. show how you got the answer. if your answer is correct but does not show how you got the answer you will not be marked brainliest.

Change negative exponents to positive. then solve. round to four decimal places

Is the number 128.439 a rational number