AriannasMommy2010 2 years ago Needing some math help!

1. AriannasMommy2010

Life Expectancy: The number of years a person in the united states is expected to live can be approximated by the equation y=0.189x=70.8,where x is the number of years since 1970.solve this equation for x. use this new equation to determine in which year the approximate life expectancy will be 80.2 years.

2. mathstudent55

What's supposed to be between 0.189x and 70.8? Is it a + sign?

3. AriannasMommy2010

yes

4. AriannasMommy2010

sorry

5. mathstudent55

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6. AriannasMommy2010

thank you!

7. AriannasMommy2010

i have one more ?

8. mathstudent55

wlcm

9. AriannasMommy2010

Some doctors use the formula ND=1.08T to relate the variables N (the number of patient appointments the doctor schedules in one day), D (the duration of each patient appointment), and T(the total number of minutes the doctor can use to see patients in one day). Solve the formula for N. Use this result to find the number of patient appointments N a doctor should make if she has 6 hours available for patients and each appointment is 15 minutes long. ( Round your answer to the nearest whole number).

10. AriannasMommy2010

Some doctors use the formula ND=1.08T to relate the variables N (the number of patient appointments the doctor schedules in one day), D (the duration of each patient appointment), and T(the total number of minutes the doctor can use to see patients in one day). A. )Solve the formula for N. B.)Use this result to find the number of patient appointments N a doctor should make if she has 6 hours available for patients and each appointment is 15 minutes long. ( Round your answer to the nearest whole number).

11. mathstudent55

A. To solve for N, just divide both sides by D

12. AriannasMommy2010

im not sure how to work it out :/ i suck at math

13. mathstudent55

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14. mathstudent55

For part B., you need to use T = 6 hours, but you must convert this to minutes. D = 15

15. AriannasMommy2010

16. AriannasMommy2010

?

17. mathstudent55

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18. AriannasMommy2010

I have another question

19. AriannasMommy2010

whats the second part to this: The number of years a person in the united states is expected to live can be approximated by the equation y=0.189x+70.8,where x is the number of years since 1970.solve this equation for x. use this new equation to determine in which year the approximate life expectancy will be 80.2 years.

20. AriannasMommy2010

this is what i have already y=0.189x+70.8 Subtract 70.80 from both sides y- 70.8=0.189x Divide both sides by 0.189x y-70.8/0.189=x

21. AriannasMommy2010

?

22. mathstudent55

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