1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Maru [420]
3 years ago
15

If the first term of AP is 4 and the sum of first five term is equal to one-fourth of the sum of the next five term, then find t

he 15th term?​
Mathematics
1 answer:
patriot [66]3 years ago
5 0

Answer:

15th term = 116

Step-by-step explanation:

a= 4

Sum of an A.P = n/2 {2a + (n-1)d}

sum of first five term is equal to one-fourth of the sum of the next five term

5/2{ 2*4 + (5-1)d} = 1/4 × 10/2{2*4 + (10-1)d

5/2 {8 + 4d} = 1/4 × 5{ 8 + 9d}

40/2 + 20/2d = 1/4{ 40 + 45d)

20 + 10d= 40/4 + 45/4d

20 + 10d = 10 + 45/4d

20 - 10 = 45/4d - 10d

10 =45d - 40d /4

10 = 5/4d

Divide both sides by 5/4

10 ÷5/4 = d

10×4/5 = d

40/5 = d

8 = d

d= 8

Find the 15th term

15th term = a + (n-1)d

= 4 + (15-1)8

= 4 + (14)8

= 4 + 112

= 116

The 15th term is 116

You might be interested in
You invested money in two funds. Last year, the first fund paid a dividend of 8% and the second a dividend of 5%, and you receiv
Angelina_Jolie [31]

You invested 11000 in in 2st fund and 9000 in 2nd fund

<h3><u>Solution:</u></h3>

Given that, You invested money in two funds.  

Last year, the first fund paid a dividend of 8% and the second a dividend of 5%, and you received a total of $1330.  

This year, the first fund paid a 12% dividend and the second only 2%, and you received a total of $1500.

Let the amount in Fund I be $x and amount in Fund II be $ y

Then, for last year ⇒ 0.08x+0.05y=1330 ----- eqn (1)  

And for this year ⇒ 0.12x+0.02y=1500 ------- eqn (2)  

Multiply (1) by 2 ⇒ 0.16 x + 0.1 y = 2660  

Multiply (2) by 5 ⇒ 0.6 x + 0.1 y = 7500

Subtract the two equations  

(2) ⇒ 0.6x + 0.1y = 7500

(1) ⇒ 0.16x + 0.1y = 2660

(-) --------------------------------

0.44x + 0 = 4840

x = 11000

Now, from eqn (2)  

0.12(11000) + 0.02y = 1500  

0.02y = 1500 – 1320  

0.02y = 180  

y = 9000

Hence, he invested 11000 in in 2st fund and 9000 in 2nd fund

5 0
3 years ago
Ricardo spends 8/9 hr. reading the paper. He spends 1/4 of the time reading world news and splits the remaining time equally bet
lapo4ka [179]
Total time spent reading is = 8/9 hour

He spends 1/4 of the time reading world news. That is =  1/4 * 8/9 =  2/9 hour

Splits the remaining time equally.  Remaining time =  8/9 - 2/9 =  6/9

Splitting it equally =  6/9  divided by 2 =  6/9  * 1/2 =  3/9  = 1/3

Time spent reading comic is = 1/3 hour

I hope this helps.
5 0
3 years ago
The number 6458 rounded to the nearest thousand
Murrr4er [49]

Answer:

6500

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
1/9 + 2/9 in simplest form
vladimir2022 [97]
1/3 + 2/9 equals 3/9
3/9 is then simplified to 1/3 :)
8 0
3 years ago
Read 2 more answers
Please help me solve this problem
Diano4ka-milaya [45]

Answer:

20 feet

Step-by-step explanation:

48 inches is equivalent to 2 feet

so basically 10 x 2 gets you 20 feet

6 0
3 years ago
Other questions:
  • Each week, you drive 150 miles. Your car gets 25 miles to the gallon, and gas prices are $3 per gallon. How much gas money will
    15·1 answer
  • A shop uses cone-shaped coffee filters in its coffee pots. Each filter has a diameter of 5 inches and a height of 4 inches. What
    12·2 answers
  • in triangle abc, angle b is 10 degrees greater than angle a. Angle c is twice as much as angle A. what's the measure of each ang
    11·1 answer
  • Ramona earns $32,385.60 annually.What is her average biweekly gross pay
    14·1 answer
  • What value is equivalent to 30 − 23 × 3?
    13·2 answers
  • In the diagram, the measure of angle 3 is 105°
    7·1 answer
  • There are two pencils.One is 14 cm long,the other is x cm if x=10, what is the total length of the two pencils​
    15·1 answer
  • For x= 2, what is the value of the expression in the box? The expression is 3.6 divided by x A. 1.6 B.18 C.0.18 D.1.8
    13·1 answer
  • a university is comparing the grade point averages of biology majors with grade point averages of engineering majors. the univer
    14·1 answer
  • Tyler is shooting 65% from the free
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!