Which of the following is unbalanced? A.
2Fe + 3Cl2 → 2FeCl3

B.
2Na + 2H2O → 2NaOH + H2

C.
SnO2 + H2 → Sn + 2 H2O

D.
N2O5 + H2O → HNO3

Three times the difference of federico’s age, and 4, increased by 7, is greater than 37. what are possible values of federico’s age?

The price of a visit to the dentist is calculated according to the formula 50+100n50+100n where nn is the number of cavities the dentist finds. on your last visit to the dentist, 22 cavities were found. what was the cost of your visit?

Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x,and the distance in miles, y, that he travels.