Solve the problem. Assume the x-axis is horizontal, the positive y-axis is vertical (opposite g), the ground is horizontal, and only the gravitational force acts on the objects. A projectile is launched from the origin at an angle of ? radians to the horizontal and an initial speed of 
Find the position function r(t) for this projectile.
A. r(t) = (175t cos ?)i + (175t sin ? - 16t2)j
B. r(t) = (175t sin ? - 16t2)i + (175t cos ?)j
C. r(t) = (175t sin ?)i + (175t cos ? - 16t2)j
D. r(t) = (175t cos ? - 32t2)i + (175t sin ?)j
Answer: A
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Solve.The pressure of a gas varies jointly as the quantity of the gas (measured in moles) and the temperature and inversely as the volume of the gas. Suppose that the pressure of a particular gas is src="https://sciemce.com/media/4/ppg__10703191657__f1q63g5.jpg" alt="" style="vertical-align: -4.0px;" /> and the volume is 
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A. 2592 B. 2577 C. 2567 D. 2587