Which of these statements is a trigonometric identity? provide evidence to support your claim.
statement 1: sin2(theta) = 1 − cos2(theta) for theta any real number.
statement 2: 1 − cos(theta) = 1 − cos(theta) for theta any real number.
statement 3: 1 − cos(theta) = 1 + cos(theta) for theta any real number.

Is the square root of 4 plus the square root of 16 rational?

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.