\_form#0=100x34:\[X_i = \frac{(N_i \cdot A_i)}{\sum_j (N_j \cdot A_j)}
\]
\_form#1=14x13:$N_i$
\_form#2=14x13:$A_i$
\_form#3=66x33:\[Y_i = \frac{N_i}{\sum_j N_j}
\]
\_form#4=93x31:\[\bar{A} = \frac{\sum_i (N_i \cdot A_i)}{\sum_i N_i}
\]
\_form#5=93x28:\[Y_e = \sum_i (N_i \cdot Z_i)
\]
\_form#6=11x13:$Z_i$
\_form#7=55x16:$\sum_{i=1}^{7}X_{^{i}H}$
\_form#8=60x16:$\sum_{i=3}^{10}X_{^{i}He}$
\_form#9=98x34:\[X_i = \frac{(Y_i \cdot A_i)}{\sum_j (Y_j \cdot A_j)}
\]
\_form#10=11x13:$Y_i$
\_form#11=66x33:\[X_i = \frac{Y_i}{\sum_j Y_j}
\]
\_form#12=90x34:\[\bar{A} = \frac{\sum_i (Y_i \cdot A_i)}{\sum_j Y_j}
\]
\_form#13=90x28:\[Y_e = \sum_i (Y_i \cdot Z_i)
\]