KieraKimball
04.02.2020 •
Mathematics
Find the sum of the geometric series. 20-5+5/4-5/16
Solved
Show answers
More tips
- L Leisure and Entertainment How to Solve a Rubik s Cube Easily and Quickly...
- H Health and Medicine Want to Lose Weight? Gain Muscle without Damaging Your Health!...
- F Family and Home Parquet or laminate, which is better?...
- L Leisure and Entertainment How to Properly Wind Fishing Line onto a Reel?...
- L Leisure and Entertainment How to Make a Paper Boat in Simple Steps...
- T Travel and tourism Maldives Adventures: What is the Best Season to Visit the Luxurious Beaches?...
- H Health and Medicine Kinesiology: What is it and How Does it Work?...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
Answers on questions: Mathematics
- M Mathematics Help with this please...
- M Mathematics Fifty percent of a number is 40. what is 70%of the said number?...
- M Mathematics Mr. Cullen needs 91 carpet squares. He has 49 carpet squares. If the square are sold in boxes of 6, how many more boxes of carpet squares does Mr. Cullen need to buy?...
- M Mathematics Right answer will get a brainlist....
- M Mathematics A square has a perimeter of 52m what is the length of each side...
- M Mathematics Solve for x and find DE....
- M Mathematics Tell whether the angles are adjacent or vertical. Then find the value of x....
- M Mathematics 3|4x-9=27how to solve this...
- M Mathematics The Red Cross is distributing water to disaster victims. They have 500 gallons of water and they give 2 gallons to each person in need. Write an equation describing the amount of...
- M Mathematics Right answer gets brainlist....
Ответ:
The sum of the geometric series is 15.9375
Step-by-step explanation:
* Lets revise the geometric series
- There is a constant ratio between each two consecutive numbers
Ex:
5 , 10 , 20 , 40 , 80 , ………………………. (×2)
5000 , 1000 , 200 , 40 , …………………………(÷5)
* General term (nth term) of a Geometric series:
- U1 = a , U2 = ar , U3 = ar² , U4 = ar³ , U5 = ar^4
- Un = ar^n-1, where a is the first term , r is the constant ratio
between each two consecutive terms and n is the position
of the number in the series
* The sum of first n terms of a Geometric series is calculated from
the formula Sn = a(1 - r^n)/1 - r
* Lets solve the problem
∵ The geometric series is 20 , -5 , 5/4 , -5/16
∴ n = 4
∴ a = 20
∵ r = second term /first term
∴ r = -5/20 = -1/4
∵ Sn = a(1 - r^n)/1 - r
∴ S4 = 20(1 - (-1/4)^4)/(1 - (-1/4))
# Note: we neglect the -ve sign with the even power
∴ S4 = 20(1 - (1/256))/1 + 1/4 = 20(255/256)/(5/4)
∴ S4 = (1275/64)/(5/4) = 15.9375
* The sum of the geometric series is 15.9375
Ответ:
1 5/12
Step-by-step explanation:
2 1/3 = 7/4
3 3/4 = 15 / 4
The amount they eat = The amount they picked - The amount they remained
The amount they eat = 15 / 4 - 7/3
=45-28 / 12
=17/12
= 1 5/12