Marco is buying a new skateboard that is on sale for 25% off. The regular price of the skateboard is $59.95. Marco knows that there is a 7% sales tax. What is the total amount that he should expect to pay, including the tax?

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Can someone me find the original price? the discount is 5% and the sale price is $68.40

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).