What value of x will make parallelogram ABCD a rhombus?

x = ?

x=34

Step-by-step explanation:

3x-12=90

3x-12+12=90+12

3x=102

3x/3 = 102/

x=34

Step-by-step explanation:

From the picture we have

AD = CD = BC = AB

it's enough to say that this quadrangle is a rhombus.

The diagonals in each rhombus are perpendicular and divide to half.

Therefore we have the equation:

3x - 12 = 90            add 12 to both sides

3x - 12 + 12 = 90 + 12

3x = 102          divide both sides by 3

3x : 3 = 102 : 3

x = 34

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

step-by-step explanation: