A certain social media site charges per ad. The price for posting one ad is $500. If four ads are posted, the price per ad is now $430. What is the percent savings for posting four ads?
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step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.

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step-by-step explanation:

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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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