At equilibrium,
a. all reactions have ceased.
b. only the forward reaction continues.
c. only the reverse reaction continues.
d. both the forward and reverse reactions continue.

d. both the forward and reverse reactions continue.


Equilibrium is when buyers will purchase exactly as much as sellers are willing to sell, what is the condition that has been reached
A market index is a resulting value created from the combination of several stocks and other  investment vehicles presenting its total value against a base value at a certain period. It is used to show the whole stock market at the same time keeping track with the way the market changes overtime. The practice of tracking the value of the stock market over a period of time can be used to benchmark to make a credible comparison of stock returns.

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