Based on the clue 'at 49 margrethe ii of this scandinavian country is...', what is the answer?

Based on the clue 'at 451 feet tall the one named for khufu at giza i...', what is the answer? Based on the clue 'at 46 years 177 days he died at the youngest age o...', what is the answer? Based on the clue 'at 465 square miles its californias largest city i...', what is the answer? What is associated with: at 4710 feet deep this african lake is the worlds second deepest lake trailing only lake baika… Based on the clue 'at 5 10 she mrs looking straight into the eyes of ...', what is the answer? Based on the clue 'at 5 10 shes straight as an aerosmith the daughte...', what is the answer? Based on the clue 'at 5 foot 4 this 4th president was the shortest', what is the answer? What is associated with: at 50 cents a dog its how many dogs jill will have to walk to buy that 43500 porsche?