there is three different questions, plz can you answer all of three. Thank you so much

Write a balanced equation for the combination reaction described, using the smallest possible integer coefficients. When carbon (graphite) combines with oxygen, carbon dioxide is formed. Write a balanced equation for the combination reaction described, using the smallest possible integer coefficients. When diphosphorus pentoxide combines with water, phosphoric acid is formed. Write a balanced equation for the combination reaction described, using the smallest possible integer coefficients. When iron combines with oxygen, iron(II) oxide is formed