Problem Calculate the acute angle between two intersecting surfaces whose equations are as follows: $$2x - 4y - z = -5$$
$$3x + 4y + 5z = -6$$
Problem If $\arcsin (3x - 4y) = 1.571$ and $\arccos (x - y) = 1.047$, what is the value of $x$?
Answer Key
Problem A 523.6 cm3 solid spherical steel ball was melted and remolded into a hollow steel ball so that the hollow diameter is equal to the diameter of the original steel ball. Find the thickness of the hollow steel ball.
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