Which one of the following compounds have a coefficient present? Choose all correct answers. Group of answer choices

3NaCa

H3N2O

3CO

NO3

An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)