Write down the value of 2b - 4a PLEASE HELP

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?

Which function has the same domain as y=2x

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9