49.99 = 0.6x, where x = original coat of jacket.
To solve for x divide both sides by 0.6, and you get x = $83.32 (rounded)
I believe the answer could be
h = -16t^2 + 32t + 12
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To find Interquartile rage you subtract quartile 1 from quartile 3
You can buy 5 bottles because $4 times 5 equals $20. I hope this helps :)