[trigonometric graphs]use the following information to write an equation of the graph described: 12. cos; amp = 2, period of 10π/3, reflect over x-axis. write one sine and one cosine equation for each graph below. (picture, #13-14)the numbers on the x-axis are π and 2π. the numbers on the y-axis are 1 and 2.explain.

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

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