Answer

Step-by-step explanation:
The diagonals of kite KLMN meet at 90°
Since, LK and KN are congruent,
and
form a set of opposite congruent angles. Congruent angles are equal.
All interior angles of a kite add up to 180°, therefore:-

The outliers are the bars with the 3rd most shaded in it. Also so this is specific but your picture quality isn't the best.
M is Matt's sticker count, D is David's:
The equations:
The average sticker count has to be 120, so:
(M + D) / 2 = 120
Matt has twice as many as David:
M = 2D
Substitute for M in the average, so:
(2D + D) / 2 = 120
Solving you get:
3D = 240
D = 80 and 120 - 80 is 40, so Matt has to give him 40 stickers.
Hope this helps :)
Answer:15
Step-by-step explanation: 9^2+12^2=c^2 and solve :)