Tell whether the graph of the quadratic function y=-x^2-10x+1 opens upward or downward.
a. because , the parabola opens upward.
b. because , the parabola opens downward.
c. because , the parabola opens upward.
d. because , the parabola opens downward.

Which of these tables represents a non-linear function?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Find the area of the regular hexagon if a side is 20 cm.