anonymous
  • anonymous
2 questions...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
Determine if the graph is symmetric about the x-axis, the y-axis, or the origin. (5 points) r = 5 + 4 cos θ x-axis only y-axis only No symmetry Origin only
anonymous
  • anonymous
Find an explicit rule for the nth term of the sequence. (5 points) 7, -7, 7, -7, ... an = 7 • (-1)n - 1 an = 7 • (-1)n an = 7 • 1n - 1 an = 7 • 1n + 1
anonymous
  • anonymous
Given that the graph of cosine function is like the picture below: |dw:1435057103375:dw|. The 4 that multiplies the cos, means that every value of y is going to increase by a factor of 4. At the end, the shape remains and it is just that the graph is more stretched vertically. The 5 that adds the function, means that every coordinate has to increase by 5 at the y-coordinate. In this scenario, the graph will basically move upwards in the y-axis, but still maintaining the same shape. Ultimately, the graph still has a symmetry in the y-axis. Therefore, answer is A.

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More answers

welshfella
  • welshfella
for the second question try plugging in values for n = 1,2 and 3 into the options to which one fits
welshfella
  • welshfella
for example when n = 1 a1 = 7 * (-1)^1-1 = 7* (-1)^0 = 7*1 = 7
welshfella
  • welshfella
so n =1 fits the first option now try n = 2
welshfella
  • welshfella
when n = 2 a2 = 7 * (-1)^(2-1) = ? can you work that out?
anonymous
  • anonymous
an = 7 • 1n - 1???
welshfella
  • welshfella
(-1)^(2-1) = (-1)^1 = ?
anonymous
  • anonymous
an = 7 • 1n - 1???
anonymous
  • anonymous
@welshfella
anonymous
  • anonymous
@welshfella
welshfella
  • welshfella
you replace the n by 2 an = 7 (-1)^(n-1) so a2 = 7 (-1)^(2-1)
welshfella
  • welshfella
a2 = 7 * (-1)^1 = 7* (-1) = -7 this is the same value as in the series so it looks like we have the correct option to confirm this work out the third term a3 which should come to 7 a3 = 7 * (-1)^(3-1) can you do that?
welshfella
  • welshfella
first work out the 3 -1
welshfella
  • welshfella
a3 = 7 * (-1)^2 can you continue?
welshfella
  • welshfella
you need to work out (-1)^2 next
welshfella
  • welshfella
(-1)^2 = -1 * -1 = ?
anonymous
  • anonymous
1?
anonymous
  • anonymous
@welshfella
welshfella
  • welshfella
right so finally a3 = 7*1 = ?
anonymous
  • anonymous
7!
anonymous
  • anonymous
@welshfella
welshfella
  • welshfella
yes so the first 3 terms are 7,-7,7 so we've found the correct option ( a4 = -7 ) correct option is A
anonymous
  • anonymous
Thank you so much... I love you
anonymous
  • anonymous
@welshfella
welshfella
  • welshfella
ok ok! yw
anonymous
  • anonymous
lol chappy you forgot to close the question /_^

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