Please Help!! :) Find (f • g) where f(x)=1/x+1 and g(x)=-1/x

a. x/x-1

b. -x+1/x

c. 1/x+1

d. x+1/x

Determine if the function f(x)=-sqrt 3x-27 is one-to-one

Find the inverse of f(x)= -sqrt 3x-27

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

Yvaries inversely as x. y =12 when x=5. find y when x=4

When a 757 passenger jet begins its descent to the ronald reagan national airport in washington, d.c., it is 3900 feet from the ground. its angle of descent is 6 degrees. how far must the plane fly to reach the run way? a. 37,106 ft b. 37,310.4 ft c. 23,456.6 ft d 2,492.7 ft