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Sound waves have mass, as they are the longitudinal (along the path of the wave) vibration shockwave of molecule, while light waves do not, as they are the transverse displacement of just energy.

Take any polynomial, eg/ y=x³+¹/₂x²-3x+9. Then ^dy/_dx=3x,+x-3, i...

Take any quadratic equation, eg/ 3x²+4x-2=5, and rearrange to equal 0, ie/ 3x²+4x-7=0  ...

If body temperature is too high:

Capillaries dilate, increasing the blood supply to the skin and allowing heat to be lost from the body by radiation.

If body temperature is t...

For any right-angled triangle, the square of the hypotenuse (the side opposite the right angle) is the sum of the square of the remaining two sides.