Desperately need . geometry. cosines/sines. find c and round to the nearest tenth

Don't get desperate Erica. These aren't so bad. I went over the Trig menu last time; let's talk about when we might use Law of Sines, Law of Cosines, or Triangle Angles.

If we have two angles we could use Triangle Angles (they add to 180) to get the third.

The Law of Sines takes two angles and their opposite sides; we use it when we have three of four of those.

The Law of Cosines takes three sides and one angle; we use it when we have three of four of those.

Pro Tip: If you ever get a choice between the Law of Cosines and the Law of Sines, use the Law of Cosines.

This one we only have sides, so it's Law of Cosines time to get the angle.

It's important to label the sides correctly. c=16 feet opposite vertex C. a=17 and b=18 (but it wouldn't be a problem to swap those.)

The cosine is great for triangle angles because a given cosine uniquely determines a triangle angle between 0 and 180 degrees.

51.3°

fahrenheit

step-by-step explanation:

fahrenheit is more precise than celsius. the ambient temperature on most of the inhabited world ranges from -20 degrees fahrenheit to 110 degrees fahrenheit—a 130-degree range. on the celsius scale, that range is from -28.8 degrees to 43.3 degrees—a 72.1-degree range. this means that you can get a more exact measurement of the air temperature using fahrenheit because it uses almost twice the scale.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq