Can someone me or at least tell my why my answer is wrong?

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Use set buikder notation to represent the following set: {, -2, -1, 0}

Arectangle with an area of 47 m² is dilated by a factor of 7. what is the area of the dilated rectangle? enter your answer in the box. do not leave your answer as a fraction.