Giving 20 points
HELPPP!! I need a dividing fractions word problem and it needs to be solved to.

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

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.