What is the secret password for the 1.11 mid unit practice test

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Can someone me with 3 and 4 plz. this is for masteries test.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %