What is four hundred twenty-eight and forty-six hundredths written in standard form? 5th grade

What is the standard form of -5x^2+2x^4-11+x^3+3x

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.