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Sariah

  • 3 years ago

Solve the problem. Instruments on a satellite measure the amount of power generated by the satellite's power supply. The time t and the power P can be modeled by the function P = 50e^{-t/300}, where t is in days and P is in watts. How much power will be available after 378 days? Round to the nearest hundredth. a. 141.8 watts b. 14.18 watts c. 1.41 watts d. 0.14 watts

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  1. Sariah
    • 3 years ago
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    Are you sure?

  2. Sbdenney
    • 3 years ago
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    25% chance :)

  3. Sbdenney
    • 3 years ago
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    no im not

  4. Elekt
    • 3 years ago
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    Why not just plug in t = 378 in the expression?

  5. sdgewrh
    • 3 years ago
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    girl : Am I pretty? Boy : NO. Girl : Do you want to be with me forever? Boy : NO. Girl : Would you cry if I walked away?Boy : NO. She heard enough, and was hurt. She walked away, tears ran down her face. The boy grabbed her arm. Boy : Your not pretty, your beautiful. I don't want to be with you forever, I NEED to be with you forever. And I wouldn't cry if you walked away, I would DIE. (Boy whispers) : Please? Stay with me. (Girl whispers) : I will. Tonight at midnight your true love will realize they love you. Something good will happen to you between 1-4 pm. Tomorrow it could be anywhere. Get ready for the biggest shock of your life! If you don't post this to 5 other pages. You will have relationship problems for the next 10 years

  6. Sariah
    • 3 years ago
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    Jajaja you are funy...

  7. Elekt
    • 3 years ago
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    Plugging in t = 378 gives 14.18 watts, option b. If I have understodd the problem, this is correct.

  8. Sariah
    • 3 years ago
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    Elekt how can be sure that this the right answer?

  9. Elekt
    • 3 years ago
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    Well, if I have understood the problem, it asks how much power it is after 378 days. Since you have a function that describes the amount of power at any instant t, it should just be to plug in t = 378 days when t is in days :)

  10. Sariah
    • 3 years ago
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    ok you are right... thanks... i have mor question dear can you keep helping me ?

  11. Elekt
    • 3 years ago
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    Yes, sure :)

  12. Sariah
    • 3 years ago
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    List all the elements of B that belong to the given set. \[B =\left\{ 5,\sqrt{7,-3.0,} \right\} 0>5 0.62\] Rational numbers a. \{5,0\} b. \{\sqrt{7},\frac{0}{5},0.62\} c. \{ \sqrt{7} \} d. \{5,-3,0,\frac{0}{5},0.62\}

  13. Elekt
    • 3 years ago
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    Hmmz, not even sure what that means because of the \[0 > 50.62\] in there :P

  14. Elekt
    • 3 years ago
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    And are you just supposed to list the rational elements of that set?

  15. Sariah
    • 3 years ago
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    |dw:1322514839073:dw|

  16. Elekt
    • 3 years ago
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    Ah, well then the elements of the set will be all the numbers inside there, unless you are looking for just rational numbers. In that case, it will only be 5, -3, 0, 0/5, 0, 62

  17. Sariah
    • 3 years ago
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    Question 10 Find the value of the indicated trigonometric function of the angle θ in the figure. Give an exact answer with a rational denominator. |dw:1322515842341:dw| a. \frac{8 \sqrt{39}}{39} b. \frac{5}{8} c. \frac{5 \sqrt{39}}{39} d. \frac{ \sqrt{39}}{8}

  18. Elekt
    • 3 years ago
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    But I guess since some of the elements occur several times, you need just list up the the numbers that occur several times just once.

  19. Sariah
    • 3 years ago
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    ok, I have sent othe Question? Please hkeep help me...

  20. Elekt
    • 3 years ago
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    yes, \[\sin \theta = \frac{5}{8}\] Because sines is defined as the relationship between the opposite side and the hypotenuse.

  21. Sariah
    • 3 years ago
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    Solve the problem. Susan purchased some municipal bonds yielding 7% annually and some certificates of deposit yielding 9% annually. If Susan's investment amounts to $19,000 and the annual income is $1590, how much money is invested in bonds and how much is invested in certificates of deposit? a. $13,500 in bonds; $5500 in certificates of deposit b. $5500 in bonds; $13,500 in certificates of deposit c. $13,000 in bonds; $6000 in certificates of deposit d. $6000 in bonds; $13,000 in certificates of deposit

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