A. s.a.! similarity in right triangles, (solve for x)a). 10.5b) 10c) 20d)

x = 6

Step-by-step explanation:

As we can see, there are 3 right triangle in the photo

Let y be the altitude of the largest triangle.

Let z be the left side.

x² + z² = (9+3)²

<=> x² + z² = 144(1)

y² + 3² = z² (2)

y² + 81 = x²  

<=> y² = x²  - 81 (3)

Substitute (3) and (2) into (1), we have:

x² + z² = 144 (1)

<=> x² + y² + 3²  = 144

<=> x² + (x²  - 81) + 9 =144

<=> 2x² =  216

<=> x² = 108

<=> x = 6

$15.40 per mile

step-by-step explanation:

you have to round up to 4 because 6 is over 5 so you have to round the 3 up to 4