<h3>
First Method:</h3>
<u>Using cosine rule</u>:




<h3>
Second Method:</h3>
<u>First find XY using sine rule</u>:



Then use Pythagoras Theorem:
⇒ XY² + YZ² = XZ²
⇒ (6)² + YZ² = 12²
⇒ YZ² = 144 - 36
⇒ YZ = √108
⇒ YZ = 6√3
⇒ YZ = 10.4
The answer is 138 if u plain out subtract it
Answer:
12!!!!!!!!!!!!!!!!!!!!!!!
Step-by-step explanation:
Since, there is $9 rebate on a $38 chair
Therefore cost price of on chair = 38 - 9 = $29