The scores on a university examination are normally distributed with a mean of 62 and a standard deviation of 11. if the top 10% of students are given a's, what is the lowest mark that a student can have and still be awarded an a?

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.

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Order the equations from least to greatest based on the number of solutions to each equation.-4^x -1 = 3^(-x) – 2 -3x + 6 = 2^x+13^x – 3 = 2x - 2