Can someone help me solve this please?

61.5°

Step-by-step explanation:

let's say the midle point as 0

mCOD = 180° - 140° = 40°

mEOF = mCOF - (mCOD + m DOE) = 180 - 40 - 83 = 57°

∆EFO is Isosceles Triangle with EO = FO then

mEFC = (180 - mEOF) : 2 = (180 - 57) : 2 = 61.5°

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you