Answer:
Step-by-step explanation:
t=3
Answer:
for 4 years: 
For n years: 
Step-by-step explanation:
Since each year the growth rate is 3.5 of the last year, n will represent the number of years.

Therefore since n is 4, the equation will be:

Therefore this equation represents the town after four years.
Answer:
x = 24.8
Step-by-step explanation:
2x + 12.8 + 117.6 = 180
Then solve.
2x + 130.4 = 180
2x = 4.6
x = 24.8
Answer:
x=-1
y=10/3
Step-by-step explanation:
You can solve the system of equations by applying the elimination method as following:
- Add both equations, then:

- Finally, you must substitute the value of x obtained into one the original equations and then you must solve fot y:
