i really need help

Which number sentence correctly solves this problem?

A plane was flying 29,087 feet above the earth. Then the plane went down 17,782 feet. How high was the plane flying above the earth then?

29,087 – 17,782 = 12,705

29,087 + 17,782 = 36,769

29,087 + 17,782 = 46,869

29,087 – 17,782 = 11,305