The correct option is oh = 3.
The formula for the area A of a trapezoid is given by:
![\[ A = (1)/(2)h(b_1 + b_2) \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/twrky0drx7cfv2ol221pl4ei3udgcr20gd.png)
where h is the height, and
are the lengths of the bases.
In your case, you have
. Let's substitute these values into the formula:
![\[ 18 = (1)/(2)h(5 + 7) \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/1l3d5h52yfz589z5z86e8m2a4k1nelpa31.png)
Now, solve for h:
![\[ 18 = (1)/(2)h(12) \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/r4q96jkpk8mnuha36hh3mngln29rx1kowm.png)
Multiply both sides by 2 to isolate h:
![\[ 36 = 12h \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/hbi9rmy8hn08vfs57gj8nzmwobpse1bgr0.png)
Divide both sides by 12 to find h:
![\[ h = 3 \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/u2ne11a28go9gi8pheq87kd8n6zwdzhx9f.png)
So, the height of the trapezoid is 3.