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denis23 [38]
3 years ago
12

Find the sum of the geometric sequence. 1, one divided by two, one divided by four, one divided by eight, one divided by sixteen

Mathematics
2 answers:
krek1111 [17]3 years ago
8 0

The equation for a finite geometric sequence is Sn=a1((1-r^n)/(1-r))

a1=1

r=.5/1=.5

n=5

Using the equation:

Sn=a1((1-r^n)/(1-r))=1((1-.5^5)/(1-.5))=1((1-.03125)/(1-.5))=1(.96875/.5)=1*1.9375=1.9375

Answer Choices:

A. 1/12 or .083

B. 93

C. -1/48 or -.02083

D. 31/16 or 1.9375

The Answer is D. 31/16

igomit [66]3 years ago
5 0
a_1=1;\ a_2=\dfrac{1}{2};\ a_3=\dfrac{1}{4};\ a_4=\dfrac{1}{8};\ a_5=\dfrac{1}{16};\ ...\\\\d=a_2:a_1\\\\d=\dfrac{1}{2}:1=\dfrac{1}{2}\\\\|d| \ \textless \  1\ therefore\ the\ sum\ S\ of\ the\ geometric\ sequence\ is\ equal:\\\\S=\dfrac{a_1}{1-q}\\\\subtitute\\\\S=\dfrac{1}{1-\frac{1}{2}}=\dfrac{1}{\frac{1}{2}}=1\cdot\dfrac{2}{1}=2\\\\\\Answer:\boxed{S=2}
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The ticket price for an ice hockey match used to cost £19.60. The price has now increased by 12.5%. How much will 2 tickets cost
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Answer:

The 2 tickets will cost £44.10 after the increase.

Step-by-step explanation:

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Add the price increase to the original cost to find the new cost of each ticket.

19.60+2.45=22.05

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A store sells black ink pens for $5 and red ink pens for $4. John wishes to buy 20 pens but doesn’t wish to spend more than $92.
Zina [86]

Answer:  4r + 5(20-r) \le 92

=======================================

Explanation:

r = number of red pens

4r = cost of buying r red pens

example: if r = 10, then 4r = 4*10 = 40 is the total cost of buying 10 red pens

If John buys r red pens, then he must buy 20-r black pens so that r and 20-r add to 20.

John buys 20-r black pens, and at $5 each, so it will cost 5(20-r) dollars for just the black pens alone.

In total, John spends 4r + 5(20-r) dollars for all the pens (red & black)

We want $92 be the most he spends. This is the ceiling or highest value possible.

Therefore,

4r + 5(20-r) \le 92

--------------------

Extra info:

If you want to solve for r, then

4r + 5(20-r) \le 92

4r + 5(20)+5(-r) \le 92 distribute

4r + 100 - 5r \le 92  

100 - r \le 92

100-r+r \le 92+r add r to both sides

100 \le 92+r

100-92 \le 92+r-92 subtract 92 from both sides

8 \le r

r \ge 8

So John must buy at least 8 red pens. The most he can buy is 20 red pens since he wants 20 pens total.

8 0
3 years ago
What is the value of a in the diagram?​
joja [24]

Answer:360

Step-by-step explanation:70+70+70=120 plus 80+80+80=240

6 0
3 years ago
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