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4. Consider the functions ƒ(x) = ax³ and g(x)=ax, where a>0 is a real number; let R be the region in the first quadrant that is enclosed by these two functions.

When R is rotated about the x-axis, the 16л volume of the solid formed is Find the average value of the function g(x) = ax over the 21 interval from x=0_to_x=5.

Fig: 1