7. 15 can be written as
507 + 10)
7(10 + 5)
10(7 + 5)

7(10+5)

Step-by-step explanation:

When simplified, it's the only one that can go.

507+10)= 517, so, NO

10(7+5) = 10(12) = 10 . 12, so, NO

7(10+5) = 10(15) = 10 . 15, so, YES

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the answer is 15% decrease

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