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belka [17]
4 years ago
13

What is the sum of the geometric sequence 2,10,50... if there are 8 terms?

Mathematics
1 answer:
Alex17521 [72]4 years ago
5 0

Answer:

the answer for you is 195,312

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Una nadadora entrenó todos los días durante 21días. El primer día nadó 15 minutos, y cada día nadaba 5 minutos más que el día an
nadya68 [22]

Responder:

1 hora 55 minutos; 22 horas 45 minutos

Explicación paso a paso:

Dado que:

Tiempo el primer día = 15 minutos

Minutos adicionales cada día siguiente = 5 minutos

Número total de días

Usando la fórmula del enésimo término de una progresión aritmética:

Tn = A + (n - 1) d

A = primer trimestre = 15

d = diferencia común = 5

n = enésimo término

Tiempo de nado el último día (n = 21)

T21 = 15 + (21 - 1) 5

T21 = 15 + 20 * 5

T21 = 15 + 100

T21 = 115 minutos

= 1 hora 55 minutos

SEGUNDO.)

Suma de minutos durante las 3 semanas

Suma de n términos:

Sn = n / 2 * (primer término + último término)

Primer término = 15

Último trimestre = a21 = 115 minutos

n = número de términos = 21

Por lo tanto,

Sn = 21/2 * (15 + 115)

Sn = 10,5 * (130)

Sn = 1365 minutos

= 22 horas 45 minutos

3 0
3 years ago
Mrs. Mitchell gives a test. Six of her scores are 78, 85,85,87,90, and 93. she finds a mistake in her grading and gives everyone
Aloiza [94]

Answer:

Let be the amount of parts the student answered correctly.  Suppose that is a function between and the score of a student's project.  As the student initially receives a fixed points for turning the project in and points for each correct part, the function is initially:

When the students receive points for each correct part, the coefficient of changes, as the amount of points received per correct answer increases.  Thus:

.

5 0
3 years ago
Read 2 more answers
If the sixth term of a sequence is 128 and the common ratio is 2, then what is the first term?
Lady bird [3.3K]
Geometric progresión:
we can calculate any term, using this rule:
 
an=a₁*r^(n-1)
a₁=the first term
r=the common ratio


a₆=128
r=2

an=a₁ * r^(n-1)
128=a₁ * 2⁶⁻¹
128=a₁ * 2⁵
128=a₁ * 32
a₁=128/32=4

Solution: a₁=4
3 0
3 years ago
The winning average speed for the 2014 Daytona 500 was recorded at 145.29 miles per hour which is a correct description of 145.2
Goshia [24]
D. This is because it is a terminating decimal.
7 0
3 years ago
Please help me with this question!
Marizza181 [45]

Answer: The length of the rectangular fence is:

476m^2

4 0
3 years ago
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