Given that sin 39° -0.629, enter the cosine of a complementary angle.
COS
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The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

What is the equation of a line passing through (-6,5) and having a slope of 1/3