Ashley designed a pendant. It is a regular octagon set in a circle. Suppose the opposite vertices are connected by line segments and meet at the center of the circle. What is the
measure of each angle formed at the center?
a. 22.5°
b. 45°
C. 67.5°
d. 135°​

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

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.

An alternative to car buying is to make monthly payments for a period of time, and then return the vehicle to the dealer, or purchase it. this is called