I am lost on this assignment and need help can someone do this step by step so I won’t fail this class 1. A set of data consists of the following scores:
7 3 9 5 4
For these data, find the values for:

a. ∑X2 b. ( ∑ X)2 c. ∑ X2 + 5

2. Summation notation for two variables.
The following data consists of pairs of scores ( X and Y ) for four individuals.

X Y

5 8
2 10
3 11
7 2
Determine the values of the following expressions:

A. ∑ X Y B. ∑(X)( ∑Y)

Answer this question, only if you know the answer. 30 points and brainliest!

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.

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x