8. Find
a13
for the arithmetic sequence -17, -12, -7,

Step-by-step explanation:

General formula for a(n) = -22 + 5n, where n is the term number.

Hence a13 = -22 + 5(13) = 65 - 22 = 43.

1.8 or

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