anonymous
  • anonymous
Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80 A. an = -5 • (-4)n B. an = -5(-4)n-1 C. an = -4(-5)n-1 D. an = -5 • (4)n
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
bahrom7893
  • bahrom7893
look a1 = -5 n=1 a2=20 n=2, etc..
Jhannybean
  • Jhannybean
It would be B because in a geometric sequence, you have \[\large ar ^{n-1}\] and in finding our r, we take \(\large\frac{ a _{2} }{ a _{1} }\) and that is -4
bahrom7893
  • bahrom7893
This way you can eliminate A because term 2 doesn't match up... And I think Jhanny's right

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
thanks you that was heard
Jhannybean
  • Jhannybean
So we have a1 = -5, our r = -4 and plug it into our formula \[\large ar ^{n-1}\]
Jhannybean
  • Jhannybean
thanks bahrom :)
anonymous
  • anonymous
Can you help me with another
Jhannybean
  • Jhannybean
sure
anonymous
  • anonymous
What is the simplified form of the expression?|dw:1369539526178:dw|
Jhannybean
  • Jhannybean
Alright, for this one you have a variable with two different powers dividing eachother, and in this case, we can simply do this. \[\large \frac{ 1 }{ q ^{\color{red}{(33/4)-8} }}\]
Jhannybean
  • Jhannybean
we you know to solve \[\color{fuchsia}{\frac{ 33 }{ 4 }}-\color{green}{8}\]
anonymous
  • anonymous
|dw:1369539985575:dw|
anonymous
  • anonymous
That is the choices
Jhannybean
  • Jhannybean
hmm...something seems wrong here.
Jhannybean
  • Jhannybean
\[\frac{ 33 }{ 4 }-8*(\frac{ \color{green}{4} }{ \color{green}{4} })= \frac{ 33 }{ 4 }-\frac{ \color{darkorchid}{32} }{ \color{darkorchid}{4} }\]
Jhannybean
  • Jhannybean
Ohh I see. hm, well what do you get when you reduce 33/4- 32/4? :D
anonymous
  • anonymous
I am confused
Jhannybean
  • Jhannybean
hm?
anonymous
  • anonymous
I have no Idea what the answer is
Jhannybean
  • Jhannybean
solve (33/4)-(32/4) and we'll work from there, you'; get your answer, promise :)
anonymous
  • anonymous
I am the parent of 2 children that is failing
anonymous
  • anonymous
this looks like greek to me..
Jhannybean
  • Jhannybean
ok, what is.... 3-2?
anonymous
  • anonymous
1
Jhannybean
  • Jhannybean
good :) so 33-32 works the same way, it is also 1.
Jhannybean
  • Jhannybean
So we now have \[\frac{ 1 }{ q ^{\color{blue}{1/4}} }\]
anonymous
  • anonymous
o ok
anonymous
  • anonymous
I thank you so much
anonymous
  • anonymous
algebra has always been my worst subject
Jhannybean
  • Jhannybean
It'll get better with practice :) Practice makes people perfect in math ^_^
anonymous
  • anonymous
I remember hearing that when I was young
anonymous
  • anonymous
I have another quesiton if you are up to it?
Jhannybean
  • Jhannybean
Of course :) Math is a lot about understanding a problem as a whole and finding a relation to a technique method in solving, it's all patterns.
Jhannybean
  • Jhannybean
sure thing
anonymous
  • anonymous
I have 2 test to give to my children for the summer to help them prepare for summer school that is why I am getting the answers so I will be able to help them
Jhannybean
  • Jhannybean
Interesting
anonymous
  • anonymous
What is the simplified form of the expression?|dw:1369541274406:dw|
Jhannybean
  • Jhannybean
\[\large (3x ^{\color{forestgreen}{7/2}})^{\color{blue}{6}}(x ^{\color{green}{2}})^{\color{blue}{6}}\] here, we will start 1 part at a time. lets start with \(\large (3x ^{7/2})^{6}\)
anonymous
  • anonymous
ok what do we do next
Jhannybean
  • Jhannybean
we're going to multiply 6 to the 3 AND the x^(7/2)
Jhannybean
  • Jhannybean
Are you able to do that?
anonymous
  • anonymous
18 x
anonymous
  • anonymous
I suck
Jhannybean
  • Jhannybean
Hm.. not exactly, we have \[\large(3^{\color{blue}{6}})(x ^{\color{blue}{(7/2)(6)}})\] which gives us \[\large(729x ^{21})\]
anonymous
  • anonymous
A. 729x33 B. 3x33 C. 729x29 D. 3x29
Jhannybean
  • Jhannybean
Now that we've taken care of the first part, we can move onto the second part, which is \[\large (x ^{2})^{6} = x ^{\color{red}{6*2}}= x ^{\color{blue}{12}}\]
anonymous
  • anonymous
ok
Jhannybean
  • Jhannybean
Now we can combine both parts together so we get \[\large (729x {^\color{green}{21}}) *(x ^{\color{green}{12}}) = 729x ^{\color{red}{21+12}}\]
Jhannybean
  • Jhannybean
And adding 21 + 12 for the exponent, you'll get your answer. i've done the rest
Jhannybean
  • Jhannybean
Good luck with your other problems!
anonymous
  • anonymous
33
anonymous
  • anonymous
729x^33
anonymous
  • anonymous
am I right?
anonymous
  • anonymous
thanks so much

Looking for something else?

Not the answer you are looking for? Search for more explanations.