Which is the graph of f(x) =-2(7)^x

Two fire-lookout stations are 190 miles apart, with station a directly south of station b. both stations spot a fire. the bearing of the fire from station a is upper n 55 degrees upper e and the bearing of the fire from station b is upper s 60 degrees e. how far, to the nearest tenth of a mile, is the fire from each lookout station?

Evaluate cos2θ for cosθ = square root of 3/2

What is the solution to the equation below? 3/x-2+6=square root x-2 +8