Question

Please i need help with a few questions! Please

Answer 1

Please anybody.

Answer 2

Hmm. Seems like pattern of this sequence is this:
\[x _{n} = (-1)^n \times 2^{n+1}\]
If you have noticed, sign of the result is going back and forth to - and +, so (-1)^n is for that. And after that, I noticed that, sequence is powers of 2.

\[2^2 = 4\]
\[2^3 = 8\]
\[2^4 = 16\]
\[2^5 = 32\]

Also, when we plug the first term to the sequence, which is 1, we get 4, not 2. So we must add 1 to the power of 'n'. I hope I could explained it in clear manner. I don't know the result, because, you know, to calculate 2^20 is pretty difficult :) But this is the pattern.

Answer 3

Thank you, I've done it like you have but I've always ended up with way higher numbers than my answers choices. And for nr 12 I've ended up with 120 which is also not my answer choice.

Answer 4

Ok, the answer is A, which is 1,048,576, calculator result.

Answer 5

im gonna figure out what I did wrong cuz this is not acceptable, I've been doing this problem for over 3 hours off and on trying different stuff..

Answer 6

:)
If you need help you can message me.

Answer 7

I will. Can you help me figure nr 12 and then just one more? This is my final so I really need to get a good score..

Answer 8

So, in here we will use the distribution property of sum sign. In other words, we can use this expression like this:
\[\sum_{1}^{15}(2n + 1) = 2 \times \sum_{1}^{15}n + \sum_{1}^{15}1\]
After we simplify this expression, we will calculate them seperately.
\[2 \times (1+2+3+4+5+ ... + 15) = 240\]

\[\sum_{1}^{15}1 = 15\]

240 + 15 = 255. So the answer is C.

Answer 9

What is the other?

Answer 10

Oh my god, thank you so much! Can I like pay you or something?

Answer 11

lol, no thanks :D but if you live in america, I would like to ask you few questions :)

Answer 12

I do live in america but I am not from america. You can ask me anything. Can you please help me with this one first? I have figured some stuff out I will post it in just a minute, takes time to type out but hang on and try to figure it out too please.

Answer 13

never mind thats the wrong one I'm sorry

Answer 14

You want me to solve the circle question ?

Answer 15

Yes please. I know how to do the other one

Answer 16

Hmm. In here I don't understand what 'tenth' means in this context, since I am not a nativve speaker of english.

Answer 17

oh okay ill just guess on that one, I think I have one more hang on thats the last one I promise.

Answer 18

Is it the 47.1, the circle question?

Answer 19

Ohhh the tenth in that problems just means that I should round up, for example. 47.97 in would be 47.1

Answer 20

The last question that wants me to find its foci, sorry for that, I don't know about ellipses. We saw them but I don't remember well. Use this link:
http://www.mathwarehouse.com/ellipse/focus-of-ellipse.php

Answer 21

Okay, do you get the circle now or no?

Answer 22

Yes, let me write it down.

Answer 23

Okay, and I just saw one last one I wanted to submit my test and it said I had one unfinished problem I am so sorry, its the same but with a triangle..

Answer 24

You can see the little part of the cirle which is shaped like pie. The question wants us to find the circumference which is that pie is excluded. Let me:


We simply multiply the angle (which must be in radians) by the radius.
\[\frac{ 5\pi }{ 3 } \times 9 = \frac{ 5 }{ 3 } \times 3.14 \times 9 = 47.1\]