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## anonymous one year ago Part A: The sun produces 3.9 ⋅ 1033 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 3.25 ⋅ 103 seconds? (5 points) Part B: Which is the more reasonable measurement of the distance between the tracks on a railroad: 1.435 ⋅ 10−3 mm or 1.435 ⋅ 103 mm? Justify your answer

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1. anonymous

help please

2. anonymous

Should that say The sun produces $$3.9 ⋅ 10^{33}$$ ergs of radiant energy per second

3. anonymous

yes @jayzdd

4. anonymous

$$\large \sf \frac{3.9 ⋅ 10^{33} ~ergs} { second} \times 3.25 ⋅ 10^3 ~ seconds$$

5. anonymous

ok is there anything else to that?

6. anonymous

@jayzdd ^

7. anonymous

now we get out our calculators :)

8. anonymous

alright so i calculate that?

9. anonymous

yes

10. anonymous

alright hold on

11. anonymous

i dont know if this is right but i got 1.2675 × 10^30

12. anonymous

close

13. anonymous

$$1.2675 × 10^{37}$$

14. anonymous

ohhh ok is that the final answer?

15. anonymous

yes and you can round it

16. anonymous

ok thank you, can you help with part B also please?

17. anonymous

which measurement seems more likely?

18. anonymous

um 1.435 ⋅ 10^3 mm?

19. anonymous

yes

20. anonymous

1 mm is very small , so 10^-3 mm is extremely tiny

21. anonymous

right thank you! i have one more question that i have no idea how to work on, can you help me?

22. anonymous

okay

23. anonymous

Find the value of the following expression: (2^8 ⋅ 3^−5 ⋅ 6^0)^−2 ⋅ 3 to the power of negative 2 over 2 to the power of 3, whole to the power of 4 ⋅ 2^28 (5 points) Write your answer in simplified form. Show all of your steps

24. anonymous

????

25. anonymous

Let's rewrite this long expression

26. anonymous

ok

27. anonymous

how do i re write it

28. anonymous

alright so can you help me solve it

29. anonymous

$(2^8 ⋅ 3^{-5} ⋅ 6^0)^{−2} ⋅ \frac{3^{-2}}{2^3} 4 ⋅ 2^28$

30. anonymous

alright so the one is parentheses are first correct?

31. anonymous

I am not sure about the expression 'whole'

32. anonymous

the 4 by the fraction is in square root

33. anonymous

got it?

34. Spring98

Is there any answer to the last one?

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