If he bought 5 Pounds at 10$ then simply divide 10$ by 5. you get 2. The feed costs 2$ per pound in dollars.
First if you identify that PR is congruent to PG
then, you sent the equation up
8x-7=21
8x=28
x=7/2
HOPE THIS HELPED YOU :)
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Answer:
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Step-by-step explanation: