Pada suatu deret geometri diketahui suku ke-3 = 18 dan suku ke-6 = 486. suku pertama pada deret tersebut adalah...

Answers

Answer 1
Answer: a . r^(3-1) = 18
a . r^2 = 18...... (i)

a . r^(6-1) = 486
a . r^5 = 486 ...... (ii)

dengan membuat perbandingan dari kedua persamaan diperoleh:
r^2/r^5 = 18/486
1/r^3 = 1/27 
r^3 = 27
r = akar pangkat 3 dari 27 
r = 3

dari persamaan a . r^2 = 18...... (i)
                          a . 3^2 = 18
                          a . 9 = 18
                          a      = 18/9 = 2

Related Questions

What is the area of a rectangle with length 1/12 ft and width 3/4 ft
There goes the right problemWhat is the perimeter of rectangle EFGH shown on the coordinate plane?
(Simplify the answer if possible)5/7-2/5=
Trevor paints 1/6 of the fence surrounding his farm each day. How many days will it take him to paint 3/4 of the fence?
If 3x > or = 2x+5 then what is 3x-10 > or = 2x -__

The measure of angle F is 130 degrees.A part of angle F measures 70 degrees.
What is the measure of the other part if the angle?

Answers

130 degrees is the total degrees of the angle,
So if part of that angle was 70 degrees with a missing part you can just subtract to find the missing angle.
(130-70=60)
The missing angle equals 60 degrees
i think its 60 because 130-70 = 60 

 



A triangle has an angle that measures 80°. The other two angles are in a ratio of 7:13. What are the measures of those two angles?

Answers

The angles are B and C.


The three angles add up to 180º
A=80º
B
C

A+B+C=180º
80º+B+C=180º
B+C=180º-80º
B+C=100º  (1)

The ratio between A and B is 7/13 ; therefore:
B/C=7/13  ⇒B=7C/13    (2)

With the equations (1) and (2), we make a system of equations:

B+C=100
B=7C/13

We can solve this system of equations by substitution method:
7C/13  + C=100
least common multiple=13
7C+13C=1300
20C=1300
C=1300/20
C=65

B=7C/13
B=7*65/13
B=455/13
B=35º

Answer: The measures of those two angles are 65º and 35º.

What is 9 x 2/3 ,.........................................

Answers

6. Just type into a calculator 2/3 the \n hit the multiply button then put 9. Then your answer will come out 6
9* 2/3
= (3*3)* (2/3)
= 3*2 (because 3 and 3 cancel out)
= 6

The final answer is 6~

The male to female ratio in Taiwan is 52 to 48.Write this ratio as a fraction in reduced form. Please show work. Thanks

Answers

52/48 reduce
since they are both even start with 2
52/48= 26/24
divide by 2 again
13/12
cannot be reduced any more since 13 is a prime number
13 males/12 females

hope this helps

52=2*2*13
48=2*2*2*2*3
cancle the factors which are common

What is the opposite of –64? A. 46 B. –46 C. –64 D. 64

Answers

the answer is d 64!!

first one to answer my problem will be marked the brainyest!!!and points!!so get working!! if u have a question about the problem go to comments.

Answers

40 original
x more hours
x more than 40 means x+40 or 40+x

the total is represented by y

x+40=y or
40+x=y