Which set of ordered pairs does **NOT** represent a function? \{(-9, -7), (-8, -7), (8, 2), (9, -5)\}{(−9,−7),(−8,−7),(8,2),(9,−5)}
\{(6, 0), (-9, 5), (1, -5), (0, 0)\}{(6,0),(−9,5),(1,−5),(0,0)}
\{(4, 6), (6, 8), (3, 2), (-6, 8)\}{(4,6),(6,8),(3,2),(−6,8)}
\{(-8, 6), (-8, 5), (-9, 4), (-5, 3)\}{(−8,6),(−8,5),(−9,4),(−5,3)}

Answer is in the photo. I can only upload it to a file hosting service. link below!

cutt.ly/tz3yDpb

{(4, 6), (6, 8), (3, 2), (-6, 8)\}{(4,6),(6,8), these are the ones that DO NOT represent a function..

Step-by-step explanation:

the value of x is 9 ⇒ answer b

step-by-step explanation:

* we can solve this problem using cosine and sine rule

- in δ abc

∵ ab = 36 , bc = 28 , ac = 16

- lets find the measure of angle b using the cosine rule

∵ cos b = [ab² + bc² - ac²]/2(ab)(bc)

∴ cos b = [36² + 28² - 16²]/2(36)(28)

∴ cos b = 19/21

∴ m∠b = cos^-1(19/21) ≅ 25°

- lets find the measure of angle a using the sine rule

∵ sina/bc = sinb/ac = sinc/ab

∴ sina/28 = sin25°/16 ⇒ by using cross multiplication

∴ sina = 28 × sin25°/16

∴ sina = 0.7396

∴ m∠a = sin^-1(0.7396) ≅ 48°

- from the figure m∠abd = m∠dbc

∵ m∠abc = 25°

∴ m∠abd = 25°/2 = 12.5°

- in δabd

∵ m∠a = 48° , m∠abd = 12.5°

∵ the sum of the measures of the interior angles of any δ is 180°

∴ m∠adb = 180° - (48° + 12.5°) = 119.5°

∵ ab = 36

∵ ad = x

- use the sine rule to find x

∵ sin∠adb/ab = sin∠abd/x

∴ sin119.5°/36 = sin12.5°/x ⇒ by using cross multiplication

∴ x = 36 × sin12.5°/sin119.5° = 8.95 ≅ 9

* the value of x is 9

answer: $13,622.84

step-by-step explanation: check the picture for info and stats : )