(-9a - 20c) - (-15a + 3c) - (-22a - 7c)
= -9a - 20c + 15a - 3c + 22a + 7c
= (-9a + 15a + 22a) + (-20c - 3c + 7c)
= 28a - 16c
The regression equation is
, and it will take 31 weeks to have $50.00
<u>(a) The linear regression equation</u>
To do this, we make use of a graphing calculator;
From the graphing calculator, we have the following calculation summary:
- The sum of X = 45
- The sum of Y = 83
- Mean X = 4.5
- Mean Y = 8.3
- Sum of squares (SSX) = 82.5
- Sum of products (SP) = 128.5
The regression equation is then represented as:

Where:
and 
So, we have:

Approximate


Approximate
This means that, the regression equation is 
<u>(b) Predict the time to have $50.00</u>
This means that:

So, we have:

Subtract 1.29 from both sides

Divide both sides by 1.56

Rewrite as:

Approximate

Hence, it will take 31 weeks to have $50.00
Read more about linear regression models at:
brainly.com/question/14585820
Answer:question #1 is 2 I believe but I’m not sure about the question #2
Step-by-step explanation:
Answer:
Option D.
Step-by-step explanation:
we know that
The compound interest formula is equal to
where
A is the Final Investment Value
P is the Principal amount of money to be invested
r is the rate of interest in decimal
t is Number of Time Periods
n is the number of times interest is compounded per year
in this problem we have
substitute in the formula above