Question

help please! (:

Answer 1

@agent0smith Heyyyy! (: can you help me please!?

Answer 2

sorry i was looking and i dont know :(

Answer 3

its okay! thanks anyways! (: @nova2528

Answer 4

u need help with anythin else tho i might know somethin that you need help with

Answer 5

Find the common ratio, by dividing one number by the number before it.

Answer 6

ok i got .24 as a common ratio but idk what to do after that @agent0smith

Answer 7

ok then what! @johnweldon1993

Answer 8

^that's for finding the sum @johnweldon1993 we just want the 10th term.

Answer 9

Just realized that -_- sorry about that!! could have sworn I saw sum!

Answer 10

oh so what do i do then?… :O

Answer 11

\[\Large a_n = a_1 r^{n-1}\]r is the common ratio (0.25), a1 is the first term (first number in the sequence), n would be 10 for the 10th term

Answer 12

alright lemme try and solve it! (:

Answer 13

ummmmmm i got a really big number :I

Answer 14

make sure you're putting .25 for 'r' not just 25 :)

Answer 15

\[\Large a_{10} = a_1 (0.25)^{10-1}\]
a1 is the first term, which is....?

Answer 16

64!

Answer 17

i plugged it all in like you said and i got a huge number and idk why! :/

Answer 18

@agent0smith

Answer 19

Show me what you are plugging in.

Answer 20

Because anytime you multiply a number that is between 0 and 1 by itself, the result is always a smaller number

eg. 0.5*0.5 = 0.25, which is smaller than 0.5

0.1*0.1 = 0.01, which is clearly smaller than 0.1

Answer 21

i did everything you said :(

Answer 22

SHOW me what you're plugging in, exactly as typed into the calculator.

Answer 23

@emma97

Answer 24

well i simplified the 10-1 first and then just solved it like regular. ugh I'm so behind and confused.

Answer 25

Just show me what you plugged in. Type it.

Answer 26

64*(.25)^9

Answer 27

And your answer?

Answer 28

@emma97

Answer 29

2.44140625E^-5

Answer 30

That is not a huge number.

E means x10

2.44140625 x 10^-5 is a small number.

Answer 31

ok well idk what the heck I'm doing. so I'm guessing its C?

Answer 32

64 is 4^3, so\[\Large 64*(\frac{ 1 }{ 4})^9 = 4^3 * \frac{ 1 }{4^9 } =\] \[\Large = \frac{ 4^3 }{ 4^9 } = ?\]
use exponent laws^

Answer 33

oh my word i suck at this.

Answer 34

its 1/4096 right?

Answer 35

\[\Large = \frac{ 4^3 }{ 4^9 } = \frac{ 1 }{ 4^6} \]and 4^6 is...?

Answer 36

exactly what i said lol

Answer 37

can you please help me with some more, I'm literally dying cause I'm so stressed out @agent0smith

Answer 38

Okay

Answer 39

Put each option in place of the blank.

Then find the common ratio between the 3rd and 2nd, and the 2nd and 1st numbers. The common ratio must be the same for both, for it to be a possible term.

Answer 40

You can eliminate a couple of options right away that don't make any sense.

Answer 41

all the negative options? lol :P

Answer 42

No. If you can't eliminate any, do what I said for all of them.

Answer 43

do i divide them or subtract i forgot

Answer 44

Divide one by the number before it

Answer 45

i got -5 for both with the first answer choice

Answer 46

so im assuming thats the correct answer?

Answer 47

Yep

Answer 48

gosh your a freaking genius, can you help me with this one?

Answer 49

lol thanks. This one you can use a formula but don't need to.

Just fill in all the missing numbers and add them all together, I'm sure you can notice the pattern.

Answer 50

i see the pattern but I'm still a little confused on how I'm supposed to solve it, I'm assuming 30 is coming next, do i just add all of that up and its my answer?

Answer 51

Yep, just add up all the numbers that it shows (plus the missing ones)

Answer 52

900? (:

Answer 53

Yep

Answer 54

can you help with this to please? gosh your so helpful, and the best part about this is that your helping me to actually understand it.

Answer 55

Notice it's adding 4.4 each time, from 2.2 to 6.6 to 11.

Answer 56

yes…but this stuff confuses me the most…i just don't understand it at all

Answer 57

well if you're adding 4.4 each time, there's only one possible answer

Answer 58

D?

Answer 59

No, it's the one where you're adding a multiple of 4.4... ie 4.4n

Answer 60

B?

Answer 61

Yep

Answer 62

i have a little bit more to do, do you mind helping me finish them? (:

Answer 63

@agent0smith

Answer 64

That one needs a bit more work... the common difference is the 5, the first term would be 1 (from plugging in t=1 into 5t-4)

Use the formula for sum of an arithmetic series: http://www.regentsprep.org/Regents/math/algtrig/ATP2/ArithG3.gif
n would be 18, a1 is 1, an would be found by plugging in 18 into 5t-4

Answer 65

yeahhh…I'm really lost..

Answer 66

Yeah you might be better off just using this then... http://www.wolframalpha.com/input/?i=sum+from+1+to+18+of+%285t-4%29

Answer 67

so 783 is the final answer?

Answer 68

Yep

Answer 69

omh thankssss!

Answer 70

just two more! (:

Answer 71

http://www.wolframalpha.com/input/?i=sum+from+1+to+10+of+%282n-3%29

Answer 72

(:

Answer 73

http://www.wolframalpha.com/input/?i=sum+from+0+to+15+of+2%280.5%29%5Ex

Answer 74

so is it answer 3, or 4?..

Answer 75

Well round it to the nearest whole number, which would be...

Answer 76

ok 4 lol

Answer 77

ok this is the last thing. can you just check the answers i got for these last two?

Answer 78

First looks right

No divergent series has a sum.

Answer 79

ok yeah the last one was the one i was confused on! I actually am a little stuck on this last problem if you wouldn't mind helping, and i don't mean to rush you but i have to go like right now so i have to hurry..im sorry (Part A is where I'm having trouble, i know the total of chairs is 1125)

Answer 80

( i mean beads)

Answer 81

@agent0smith

Answer 82

http://www.wolframalpha.com/input/?i=sum+from+1+to+18+%283%2B7%28n-1%29%29

Answer 83

Thankyou so so so so much i wish i could give you all of the medals in the world (: your the most helpful person on here, thank you So much you have no idea how much you saved my life! lol (: @agent0smith

Answer 84

hehe you are welcome Emma :)

Answer 85

Have a great night! your amazing! ((((:

Answer 86

Thank you :))