Because y varies inversely as x, therefore

where k = constant.
When x = 6, y = 2.5. Ther efore

Cross multiply.
k = 6 x 2.5 = 15
The equation is

When x = 4, obtain

Answer: a. 3.75
Answer:0.84164
Step-by-step explanation:
Given

we know

Applying this identity we get






Given that,
<em>In triangle ABC</em>


We know,
Sum of all interior angles of a triangle is supplementary.

<u>On adding equation (1) and (2), we get </u>





On substituting the value in equation (1) and (2), we get



Also, from equation (2), we get



Hence,

Answer:
13/4
Step-by-step explanation: