We are given

we know that

so, we get
opposite =7
adjacent=24
now, we can find hypotenuse


now, we can draw triangle and then switch vertices accordingly
we can find cos(B) using second triangle

In second triangle:
adjacent=7
hypotenuse =25
so, we get
................Answer
= 5/3 x (-7/2)
= -35/6
= -5 5/6
answer A.
-5 5/6
Answer:
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Step-by-step explanation:
= 
The 2 right triangles are similar and so the ratios of corresponding sides are equal
The corresponding sides are x and 2, 6 and 1.5, hence
= 
Answer:
5x -
= 
Step-by-step explanation: