Please help me out with this question if you help me I will give you the brain thing and extra points. 7/9 image below.

What is a property of a double replacement reaction

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98