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

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

im with everythinglos so yeahhhhh

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

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