Answer:
cos(x-30)=1/2
Step-by-step explanation:
We use the following relationship to obtain cos(x)

From that, we have that cos(x)= sqrt(1-1/4)=sqrt(3) / 4
To obtain the value of cos(x-30), lets remember the following expression:

Therefor, we can use that to obtain our desired function cos(x-30)
cos(x)*cos(30)+sin(x)*sin(30)

=2/4=1/2
Answer:
Distributive
Step-by-step explanation:
The 4y is distributed to the terms in parentheses.
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Just divide 300 by 4 since 25% is 1/4
300/4 = 75
D. 75
Hope this helps!