Marshallian demand (dX1) is a function of the price of X1, the price of X2 (assuming two goods) and the level of income or wealth (m): Hicksian demand (hX1) is a function of the price of X1, the price of X2 (assuming two goods) and the level of utility we opt for (U):
David was thirty years old when he became king, and he reigned forty years. David was thirty years old when he began to reign, and he reigned forty years in all. David was thirty years old when he began to reign, and he reigned forty years. David was thirty years old when he became king, and he reigned forty years. David was thirty years old when he began to reign, and he reigned forty years. David was 30 years old when he began his reign; he reigned 40 years. David began to reign when he was 30 years old, and he reigned 40 years.
David died at the age of 70 in 971 BC making him born 1041BC It is estimated by one authority that David about 20 years old when he was annointed to be the next king by Samuel, while another authority has him 22 years old, but splitting the difference and making him 21 - the age of majority - would be far more likely.