Ineed to simplify #28 and i need the step by step proccess. (the r6 has nothing to do with the expression)

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

What percent of 18 is 24? and plz explain thx.

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.