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Vsevolod [243]
3 years ago
15

Round 915 to the nearest ten

Mathematics
1 answer:
mixas84 [53]3 years ago
6 0
The answer would be 920. hope that helped
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The sum of the first 6 terms of a geometric series is 15,624 and the common ratio is 5.
nikitadnepr [17]

Answer:

  4

Step-by-step explanation:

The sum of n terms of a geometric series with first term a1 and common ratio r is given by ...

  Sn = a1·(r^n -1)/(r -1)

for r=5 and n=6, this becomes ...

  15624 = a1·(5^6 -1)/(5 -1) = a1·(15624/4)

Then we have ...

  1 = a1/4 . . . . . divide by 15624

  4 = a1 . . . . . . multiply by 4

The first term of the series is 4.

5 0
3 years ago
Yo plz help I have no clue what im doing
olya-2409 [2.1K]

Answer:

hi

Step-by-step explanation:

7 0
3 years ago
Vocabulary Is a repeating decimal a rational number?
Elodia [21]

Answer:

yes

Step-by-step explanation:

repeating decimal. when a fraction is changed to a decimal and the remainder is not zero, a digit or a block of digits will eventually start to repeat. terminating or repeating decimal. since a rational number is a number that can be written as a fraction, every rational number can be expressed as either.

5 0
3 years ago
What is the radius of a circle whose area is equal to the sum of the areas of two circles whose radii are 20cm & 21cm?
Xelga [282]

Answer:

5cm

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Use a common denominator to determine weather the ratio forms a proportion?
frosja888 [35]
1/7 and 3/14......common denominator is 14

2/14 = 3/14
cross multiply
(14)(3) = (14)(2)
42 = 28...not correct...no, this does not form a proportion

little tip ** proportions are nothing but equivalent fractions and 1/7 does not equal 3/14...now if it would have been 1/7 and 2/14...then it would have been a proportion
4 0
3 years ago
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