Asap! will give brainlist. a. supplementary b. vertical c. complementary d. congruent

Given this information, which expression must represent the value of b?

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}