Petra wants to buy a skateboard. The skateboard deck usually cost $37.50, but it is on sale for 20% off. PART A: If the sales tax rate is 5.2%, how much will petra pay for the skateboard deck in all?
PART B: If the selling prive of $37.50 repersents a 20% markup, will the store still make a profit afte the 20% markdown? Explain.

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.

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step-by-step explanation:

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reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.