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Dafna11 [192]
4 years ago
7

Need help with Arithmetic and geometric sequence setting up

Mathematics
1 answer:
tekilochka [14]4 years ago
3 0

First term a=2, common difference d=3, formula

a_n = a  + d(n-1)

a_n = 2 + 3(n-1)

a_{33} = 2 + 3(33-1) = 98

Answer: 98

First five terms, first term 5, common ratio 2. Write down 5, keep multiplying by two until you've written down five terms.

Answer: 5 10 20 40 80

Savings plan. Anybody see the flaw in this plan?

First term 1, common ratio 5.

a_n = 1 \cdot 5^{n-1}

a_8 = 5^7 = 78,125

Answer: $78,125

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What is the value of x in the equation 0.2(x + 1) + 0.5x = –0.3(x – 4)?
Leokris [45]
 0.2(x + 1) + 0.5x = -0.3(x - 4) 

0.2x+0.2+0.5x=-0.3x+1.2

 
 

0.7x+0.2=-0.3x+1.2 

0.7x=-0.3x+1.2-0.2 

0.7x=-0.3x+1 

0.7x+0.3x=1 

x=1
8 0
4 years ago
Read 2 more answers
Help me I have no idea how to do 18
sleet_krkn [62]

First, subtract px2 from both sides.

Now you have:

x3 - px2 = (1 - p) x1

Next, divide both sides by (1 - p)

So now you have

x3 - px2/(1 - p) = x1

...as your final answer


*You can decide if you want to leave the parenthesis in your final answer, I left them there so it could be visible where I put them. :)

5 0
3 years ago
Erica collected a total of $180 for her favorite charity over the first 3 months of the year. She collected the same amount in t
ankoles [38]
X+x+3x= 180
5x= 180
x= 36

3(36)= 108
Your answer is D. $108
4 0
3 years ago
Read 2 more answers
PLEASE HELP!!This is joshs solution for the equation x^2-6x-7=0: x^2-6x-7=0
iren [92.7K]

Answer:

  no. see below

Step-by-step explanation:

This much of Josh's working is correct:

  x^2-6x=7

  x^2-6x+9=7+9

  (x-3)^2=16

At this point Josh apparently overlooked the fact that he needed to take the square root of both sides of the equation. Had he done that, he would have ...

  x -3 = ±4

  x = 3+4 . . . or . . . 3 -4

  x = 7 or -1

_____

Josh reported values of x that would match ...

  x -3 = ±16

He <em>violated the equal sign</em> by taking the square root on the left, and multiplying by ±1 on the right. Doing different operations on the two sides of the equation will mean the value of x is changed to something other than what you're looking for.

4 0
3 years ago
Find the first four terms of the sequence given by the following.<br> an=51 + (n-1).8, n=1, 2, 3...
pav-90 [236]

Answer:

Step-by-step explanation:

a1 = 51 + (1 -1 ) * 0.8

a1 = 51

a2 = 51 + (2 - 1)*0.8

a2 = 51 + 0.8

a2 = 51.8

a3 = 51 + (3 - 1)*0.8

a3 = 51 + 2*0.8

a3 = 51 + 1.6

a3 = 52.6

a4 = 51 + (4 - 1)*0.8

a4 = 51 + 2.4

a4 = 53.4

5 0
3 years ago
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