Step-by-step explanation:
90+48=138
180-138=42
y=42
Secxcotx=cscx
1/cos * cos/sin =cscx
cos/sincos=csc
1/sin=csc
Answer: Choice A
The fractions are not equivalent because the product of the numerator of the first fraction and the denominator of the second fraction is <u> 15 </u> , which is not equal to the product of the numerator of the second fraction and the denominator of the first fraction <u> 16 </u>
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Explanation:
We have the template
which cross multiplies to 
So if
was true, then
must be true as well, and vice versa.
The left side 3*5 turns into 15, while the right hand side 4*4 becomes 16. The 15 and 16 don't match up.
In short,
turns into
which is a false statement. So the original claim that
is also false.
Answer:

Step-by-step explanation:
Given



Required
Determine 
From laws of probabilities:

In this case:


