Find Y.
Round to the nearest tenth.
Y= ? Degrees

Y = 59.0°

Step-by-step explanation:

Using the cosine rule in terms of x, y and z

cosY =

with x = 22, y = 20 and z = 18

cosY =

        =

        = , thus

Y = ( ) ≈ 59.0° ( to the nearest tenth )

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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