The population of a country is 9.7 x 107, and is increasing by 8.7 x 105 people each year. show your work for each calculation, and answer in scientific notation: 1. how many new people are added after 25 years? 2. what is the population after 25 years?

The population of a country is 9.7 x 107, and is increasing by 8.7 x 105 people each year. Show your work for each calculation, and answer in scientific notation: 1. How many new people are added after 25 years? 2. What is the population after 25 years?

 Given:

Population of the country = 9.7 X 10^7

Annual growth = 8.7 X 10^5

Population growth in 25 years = 8.7 X 10^5 X 25

= 2.175 X 10^7 (Number of people added after 25 years)

Population after 25 years = 9.7 X 10^7 + 2.175 X 10^7

= 11.875 X 10^7 (The population after 25 years)

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18