1. You must subtract both sides by 1/4n to end up with 2/4n-18=-4

2.Then you add 18 to both sides to end up with 2/4n=14

3. Now you multiply both sides by 2/4 , aka 1/2 to get n by itself, and you will end up with n=7

n=7 is your answer!

8 0

3 years ago

In a certain country the life expectancy for women in 1990 was 45 and in 2000 it was 85?years. Assuming that life expectancy bet

Darya [45]

Answer:

49145 years

Step-by-step explanation:

In a certain country the life expectancy for women in 1990 was 45 and in 2000 it was 85?years.

Assuming that life expectancy between 2000 and 2100 increases by the same percentage as it did between 1900 and 2000,what will life expectancy be for women in 2100?

In 10 years, the expectancy increased by 85/45 = 17/9

between 2000 and 2100, it will increas by 10 time 10 years, so expected expectancy is $85*(\frac{85}{45})^{10} = 49145$ years

4 0

3 years ago