Answer:

Step-by-step explanation:

<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em>
0.17/30 = x/450 <em>Use proportion</em>
76.50 = 30x <em>Cross multiply</em>
2.55 = x <em>Divide 30 both sides</em>
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7.5 minutes call would cost 2.55
Answer is D cause the equation of the line is y=3x
Answer:
x = 30.
Step-by-step explanation:
Use the identity sin A = cos (90 - A).
So sin 30 = cos (90 - 30) = cos 60.
cos 2x = cos 60
so x = 30.