## anonymous one year ago Sonji has \$5.25 in nickels and dimes.The coin value can be modeled by the equation 0.10d + 0.05n = 5.25, where d represents the number of dimes and n represents the number of nickels. If Sonji has 21 dimes, how many nickels does she have? 35 42 63 105

1. anonymous

@10115658 Sorry for bugging you >.<

2. anonymous

replace d with 21 and solve for n

3. anonymous

n=63?

4. anonymous

good job

5. anonymous

Can you help with me with another? Lol

6. anonymous

sure

7. anonymous

A sequence is defined by the recursive function f(n + 1) = 1/3f(n). If f(3) = 9 , what is f(1) ?

8. anonymous

|dw:1437167181081:dw|

9. anonymous

I don't know where to start

10. anonymous

are there choices?

11. anonymous

1 3 27 81

12. anonymous

looks like the sequence is you divide the number by 3 each time you increase the n value

13. anonymous

we want to work backward to get to f(1) so we should multiply by 3

14. anonymous

so f(3)=9

15. anonymous

multiply that by 3 to get f(2)

16. anonymous

f(2)=27

17. anonymous

Thank you!

18. anonymous

19. anonymous

we need to find f(1)

20. anonymous

so we multiply 27 by 3 to get f(1)

21. anonymous

this means the answer is 81

22. anonymous

what does f(1) represent.. if I may ask? Sorry..

23. anonymous

Is it a term?

24. anonymous

lets say f(n)=n+80

25. anonymous

f(1) means you replace the n in the equation with 1

26. anonymous

this gives f(1)=1+80

27. anonymous

does that make sense?

28. anonymous

Why'd you use 1?

29. anonymous

I must sound so stupid >.< I'm just trying to piece everything together

30. anonymous

f(1) means you replace every n with a 1

31. anonymous

f(2) means you replace every n with a 2

32. anonymous

etc...

33. anonymous

Oh okay I get it now. May I ask another question?

34. anonymous

sure

35. anonymous

Wren recorded an outside temperature of –2°F at 8 a.m. When she checked the temperature again, it was 4°F at 12:00 p.m. If x represents the time and y represents the temperature in degrees Fahrenheit, what is the slope of the line through these two data points? –1.5 –0.5 0.5 1.5

36. anonymous

what would the points be?

37. anonymous

remember x is represented by time and y is represented by temp

38. anonymous

i'll give you the first point (8,-2)

39. anonymous

what's the second point?

40. anonymous

(12,4)?

41. anonymous

yep

42. anonymous

now how do you find slope?

43. anonymous

Do I use the slope formula?

44. anonymous

ya

45. anonymous

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46. anonymous

good job

47. anonymous

48. anonymous

yep

49. anonymous

Another? When your tired of me just say so xD

50. anonymous

When a number is added to 1/5 of itself, the result is 24. The equation that models this problem is n +1/5 n = 24. What is the value n? n = 18 n = 20 n = 21 4/5 n = 23 4/5

51. anonymous

sorry i was afk

52. anonymous

It's okay :)

53. anonymous

first combine the n values

54. anonymous

n + n/5

55. anonymous

do you remember how to add fractions?

56. anonymous

yeah

57. anonymous

ok, what did you get?

58. anonymous

20

59. anonymous

well done

60. anonymous

The soccer team is conducting a fundraiser selling long-sleeved T-shirts for \$14 and short-sleeved T-shirts for \$10. So far the team has sold less than \$200 worth of the two types of T-shirts. Which inequality best represents x, the number of long-sleeved T-shirts they have sold, and y, the number of short-sleeved T-shirts they have sold? x + y < 200 x + y > 200 14x + 10y > 200 14x + 10y < 200

61. anonymous

what do you think

62. anonymous

D?

63. anonymous

yep

64. anonymous

1 more?

65. anonymous

ok

66. anonymous

The simple interest formula is I = Prt, where I represents simple interest on an amount, P, for t years at a rate of r. The equation solved for P is P =l/rt . What is the amount of money, P, that will generate \$40 in interest at a 10% interest rate over 5 years? \$60 \$80 \$90 \$100

67. anonymous

just plug in the numbers

68. anonymous

Is it b?

69. anonymous

yep

70. anonymous