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gdogthegirl
Help please!? The sales tax on a new car varies directly to(or is directly proportional) the price of the car. If $1,800 in sales tax is paid for a $25,000 car. what is the purchase price of a car worth $1,600 in sales tax? Im totally lost when it comes to variations :(
it just means that it is a fixed ratio. interest/price is fixed regardless of price
\[so \frac{ 25000 }{ 1800}=\frac{ x }{ 1600 }\]
i have to use the formula of y+kx squared to n to find it
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