Jacquie has 20 postcards in her collection. each time she goes on vaction she buys 8 postcard to add to her collection. the total number of postcards y can be represented by the equation y=8x+20.

5/12, or 5: 12

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 -

noncoplanar points are points that do not lie on the same line.

good luck on ur quiz test or homework. have a good day : )