List the two type of transporst that the cell in orde to transport molecules acroos the membrane

1) passive transport (diffusion), where substances move along their concentration gradient from high to low concentration.
2) active transport (often an ATP pump), where substances are actively pumped (usually by ATP) against the concentration gradient (low to high concentration),

Because a model would make the investigation easier to understand

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer