1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ronch [10]
3 years ago
15

7.

Mathematics
1 answer:
liraira [26]3 years ago
8 0

Answer:

A geometric series has a positive common ratio r. The series has a sum to infinity of 9 and the

sum of the first two terms is 5. Find the first four terms of the series.

Step-by-step explanation:

A geometric series has a positive common ratio r. The series has a sum to infinity of 9 and the

sum of the first two terms is 5. Find the first four terms of the series.

You might be interested in
To travel 105 miles, it takes Sue, riding a moped, 3 hours less time than it takes Doreen to travel 64 miles riding a bicycle. S
Volgvan
<span>Let t=time Doreen travels; let r=rate of Doreen

                RATE * TIME = DIST.
        Sue | r+13      t-3       105
   Doreen |   r           t          64
 
Now solve the system:
(r+13)(t-3)=105
</span>r*t=64<span>
 
</span>r= \frac{64}{t} &#10;\\&#10;\\(\frac{64}{t} +13)(t-3)=105 &#10;\\&#10;\\64- \frac{192} {t}+13t-39-105=0&#10;\\&#10;\\13t- \frac{192} {t}-80=0&#10;\\&#10;\\ 13t^2-80t-192=0&#10;\\&#10;\\t_{1,2}= \frac{80\pm \sqrt{(-80)^2-4\times13(-192)} }{2\times13}= \frac{80\pm128}{26}  &#10;\\&#10;\\t=\frac{80+128}{26}  =8&#10;\\&#10;\\r=\frac{64}{t} =\frac{64}{8} =8<span>
             
Doreen: rate = 8 mph, time = 8 hours
Sue:  </span>rate = 21 mph, time = 5 hours<span>


</span>
8 0
3 years ago
Creat an equation for a cubic function, in standard form, that has x- intercept given by the set {-3,1,7} and which passes throu
prohojiy [21]

Given :

Set of x-intercepts {-3,1,7},

point through which it passes (-2,54)

Now,

Step 1: Substitute value of x intercepts in equation, y=a(x-p)(x-q)(x-r), we get,

y=a(x-(-3))(x-1)(x-7)

y= a(x+3)(x-1)(x-7)               ... equation (1)

Step 2: substitute x an y with the point through which it passes,

54=a((-2)+3)((-2)-1)((-2)-7)

54 = 27a

∴ a=2

Step 3: Now, substituting value of a in equation (1), we have

y=(2x+6)(x^{2} -8x+7)

y=2x^{3}-10x^{2}  -34x +42   (Requited cubic equation)

   

6 0
3 years ago
This diagram shows a block of stainless steel. The mass of the block is 930g.
EastWind [94]

Answer:7.75

Step-by-step explanation:

3 0
3 years ago
A common factor of 2x+10 and 4x+8
OverLord2011 [107]

Answer:

2

Step-by-step explanation:

2(x+5) this is the most you can simplify it

2(2x+4) but you can factor out another 2 so it is 4(x+2)

5 0
3 years ago
Jeremy has a deck of cards numbered 1-12. He picks one card and then replaces it. Then he picks another card. What is the probab
LiRa [457]
The answer is 8.3 percent
5 0
3 years ago
Other questions:
  • Garret hiked 14 miles in 4 hours. Elena hiked 21 miles in 6 hours. Do these rates demonstrate a proportional relationship? Why o
    8·1 answer
  • 7,000 mg = how many grams
    12·1 answer
  • Find a positive number such that the sum of the number and its reciprocal is as small as possible?
    6·1 answer
  • Find the missing side length
    7·2 answers
  • Prove that for any arithmetic sequence a7+a10=a8+a9
    12·1 answer
  • A 7-meter roll of red ribbon costs $2.52. What is the unit price
    13·2 answers
  • Which expression is equivalent to…
    6·1 answer
  • What Ratio Matches the chart
    12·2 answers
  • -6 +|-6| + 4 = ???<br> Can anyone help me with this??
    5·2 answers
  • Pls answer the question below factorisation
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!