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Mariulka [41]
3 years ago
8

Find r for the geometric series s5=244 a1=4 and a5=324

Mathematics
1 answer:
GaryK [48]3 years ago
8 0

Answer:

-3

Step-by-step explanation:

an = a1·r^(n-1) . . . . . . general term of a geometric sequence

a5 = 324 = 4·r(5-1) . . . specifically, the 5th term

81 = r^4 . . . . . . . . . . . divide by 4

Since the sum of 5 terms is less than the 5th term, the value of r must be negative:

r=-\sqrt[4]{81}=-3

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I do not know how to do this.
Nonamiya [84]

Answer:

Step-by-step explanation:

(a) Option B cost less at 120 miles driven

The cost difference at 120 miles between option A and option B is $15

(b) Option A and B cost the same at driving 60 miles.

Option B would cost more if you drive less than 60 miles.

6 0
2 years ago
There ratio of boys to girls is 17:3 there are 740 people how many boys are there
julsineya [31]
Ratio of boys to girls= 17:3
number of people= 740

to find the number of boys out of 740 people, you have to add the ratio together and divide 740 by it. then multiply the answer by 17 because the ratio for boys is 17.

17+3=20

740÷20=37
37×17=629 

answer= 629 
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8 0
3 years ago
Express the distance traveled as a function of the number of hours at the average speed. The morris family is traveling from pro
shusha [124]

Answer:

Dist = 45 m/h * x h

Step-by-step explanation:

We know a speed is a measure of distance over time:  speed = dist / time

In this case, we are looking for a distance expressed in terms of time.

So, we only need to modify the formula a bit: dist = speed * time

We don't know the time (which will be a variable), but we know their speed.  So, the formula becomes:

Dist = 45 m/h * x h

Enter the number of hours in the formula and that will give you an approximation of the distance traveled within that time (approximation since our result will be rely on an average).

6 0
3 years ago
Fractions order from least to greatest<br> Which is the right answer? Pls help ill give brainliest!!
olya-2409 [2.1K]

Answer:

2/5, 4/7, 5/2

Step-by-step explanation:

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8 0
3 years ago
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Anika [276]

Answer:

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3 0
3 years ago
Read 2 more answers
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