Answer asap please i NEED TO ANSWER THIS

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why

Which table represents a linear function? i'll give brainliest to first answer ^'^

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2