If two angles are complementary and one of the angles measures 27°, what does the other angle measure? 27° 63° 73° 153°

Which expression is equivalent to? assume x > 0 and y > 0.

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.