Given:
Initial cost of living = $44,000
Rate of increase = 5% = 0.05
To find:
The cost of living in 20 years.
Solution:
The exponential growth model is:
Where, a is the initial value, r is the growth rate and t is the number of years.
Putting in the above model, we get
Therefore, the cost of living in 20 years is about $116745.10.
Answer:
Step-by-step explanation:
<u>Given:</u>
<u>Calculate the balance:</u>
Answer: x = -4, x = 5
Step-by-step explanation:
You can use the substitution method for this problem.
y = + 2x, but y also = 3x +20.
Because of this, you can determine that +2x = 3x + 20 because they are both equal to the same thing, y.
Solve the quadratic equation you got from substitution:
+ 2x = 3x + 20
-x = 20
-x -20 = 0
You can factor this equation:
(x+4)(x-5) = 0
x = -4, x = 5