Answer: x=14.4
Step-by-step explanation:
The triangle shown in the figure attache is a right triangle. Therefore, you can calculate the missing side "x" as following:
[tex]tan\alpha=opposite/adjacent[/tex]
Where:
[tex]\alpha=64\°\\opposite=x\\adjacent=7[/tex]
When you solve for x and substitute the values shown above, you obtain the following result:
[tex]x=7*tan(64\°)\\x=14.35[/tex]
[tex]x[/tex]≈[tex]14.4[/tex]
