Which best explains parallel forces? check all that apply.
*left and right forces that can be added together
*right and upward forces that cancel each other out
*upward and downward forces that can be added together
*left and downward forces that cancel each other out
*addition of parallel forces that cannot result in a negative force
*differences in parallel forces that result in a net force of zero

The answer is:

- left and right forces that can be added together  

-upward and downward forces that can be added together

The explanation:

-when the parallel force system is a situation in which two forces of equal magnitude act in the same direction within the same plane,

-and the parallel forces lie in the same plane and have lines of action that never intersect each other. Two forces that are parallel can either be in the same direction or in opposite directions.

and the only 2 phases that satisfy this definition are:

- left and right forces that can be added together  

-upward and downward forces that can be added together

d. learned preferences i believe is your answer

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz