FACTOR THE EXPRESSION 100 - 80 USING THE GCF

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Which is the graph of this function 3 square root of x plus one if

Is the number 128.439 a rational number