Answer:
<h2>z = 15</h2>
Step-by-step explanation:

<u>Cross multiply </u>
That's

<u>Send 15 to the right side of the equation</u>

Divide both sides by 15

We have the final answer as
<h3>z = 15</h3>
Hope this helps you
Answer:

Step-by-step explanation:

Letter D
A = 135°
B = 30°
cosAcosB - sinAsinB = cos(A+B)
cos(135°+30°)
cos(165°)