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3 years ago

What is the first term of the geometric sequence presented in the table below?

1 answer:

8 0

Fron the table given:

A3 = 112,
A8 = - 3,584

An = A1 *r ^ (n-1)

=> A3 = A1 (r^2) = 112

A8 = A1(r^7) = - 3,584

=> - 3584 / 112 = (r^7) / (r^2)

=> (r^5) = - 32

=> r = - 2

=> A1 (- 2)^2 = 112

=> A1 = 112 / 4 = 28

Answer: a1 = 28

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1/4(r-5/2)=1/8 i need an answer cant figure it out

san4es73 [151]

1/4(r - 5/2) = 1/8
Divide both sides by 1/8 :0
2(r - 5/2) = 1
r - 5/2 = 1/2
r = 1/2 + 5/2 = 6/2

r = 3 Answer

5 0

2 years ago

Read 2 more answers

-0.85 - (-¼) + 0.4 + (-⅖) ?<br> what is the value of the expression?

drek231 [11]

Answer: =−3/5

Step-by-step explanation: Hope this help :D

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2 years ago

List the 8 numbers between 4 and 40 in a sequence of 10 numbers a common difference

yuradex [85]

Answer:

8, 12, 16, 20, 24, 28, 32, 36

Step-by-step explanation:

the nth term of an arithmetic sequence is

$a_{n}$ = a₁ + (n - 1)d

a₁ is the first term and d the common difference

given a₁ = 4 and a₁₀= 40 , then

4 + 9d = 40 ( subtract 4 from both sides )

9d = 36 ( divide both sides by 9 )

d = 4

add d to each term to obtain the next term

4 + 4 = 8

8 + 4 = 12

12 + 4 = 16

16 + 4 = 20

20 + 4 = 24

24 + 4 = 28

28 + 4 = 32

32 + 4 = 36

the 8 terms between 4 and 40 are

8, 12, 16, 20, 24, 28, 32, 36

3 0

1 year ago

Ryan went to the store to buy a CD. The CD was on sale for 10% off. If Ryan paid $13.50 for the CD, what was the original price

nydimaria [60]

<span>well first off, you take 1350/9=150
then you add it all together 1350+150=1500
then your full answer would be $15 was the original price
</span>

3 0

3 years ago

Can someone plzzz help mee ill give brainlest

galina1969 [7]

Answer:

272.3 or just 272

Step-by-step explanation:

To find answer first find the area of the circle, then add the 18.

A=r*r*3.14 (pi) = 9*9*3.14=254.34

254.34+18=272.34

Hope this helps!!! :)

8 0

2 years ago