What is 1 3/4 − 3 9/10?

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.)

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.