How do i do this problem?
(similar triangles)

x = -78

Step-by-step explanation:

Write and solve an equaiton of ratios, as follows:

hypotenuse to hypotenuse:

         57                 51

  =

      2x + 7             x + 4

Cross-multiplying, we get:

57x + 228 = 102x + 351

Combining the x terms on the right, we get:

          228 = 45x + 351

Combining the constants on the left:

           -123 = 45x, and so x = -123/45 = -78

x = -78

$32,660

step-by-step explanation:

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3