Josh flips a colored chip that is red on one side and black on the other a total of 20 times. what is the probability of the 21th flip resulting in landing on the black side up?

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.

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8