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solve as a proportion
a beauty salon buys bottles of gel for $4.50 per bottle and marks up the price by 40%. for what price does the salon sell each bottle?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?