3 years ago

Find the sum of the following ap .1) 1/15, 1/12, 1/10,....,to 11 terms

Mathematics

1 answer:

sertanlavr [38]3 years ago

8 0

Answer:

33/20

Step-by-step explanation:

1/12 - 1/15 = 5/60 - 4/60 = 1/60

d = 1/60

a_n = a_1 + d(n - 1)

a_11 = 1/15 + (1/60)(11 - 1)

a_11 = 1/15 + 1/6

a_11 = 4/60 + 10/60

a_11 = 14/60

a_11 = 7/30

a_12 = 14/60 + 1/60

a_12 = 15/60

a_12 = 1/4

s_n = n(a_1 + a_n)/2

s_11 = 11(1/15 + 7/30)/2

s_11 = 11(2/30 + 7/30)/2

s_11 = 11(9/30)/2

s_11 = 99/60

s_11 = 33/20

You might be interested in

Can someone please help me

Zina [86]

A. You would use base*height (bh). You would multiply 4 and 5. The answer is 20in.

B. It would be 1/3*bh. The answer would be 6.6.

7 0

3 years ago

I feel real d.umb for asking this much of questions but tbh I don’t like algebra, my math teacher doesn't like me and she never

Iteru [2.4K]

Answer:

the first one is x=3

Step-by-step explanation:

4 0

3 years ago

Asian elephants are typically 2.1 feet shorter than African elephants. If an Asian elephant were 9.4 feet tall, how tall would a

amm1812

The elephant would be 11.5 feet tall

7 0

3 years ago

Read 2 more answers

In an apartment complex with 28 units, 19 of the renters keep a pet. What percentage does not keep a pet?

Aleks04 [339]

If 19 out of 28 renters keep a pet, there are $28-19 = 9$ renters who don't keep a pet.

Whenever you have a subset of some set, and you want to know which percentage of the set the subset represents, you simply have to compute

$\dfrac{\text{number of elements in the subset}}{\text{number of elements in the set}}\times 100$

So, in your case, you're wondering what percentage of 28 does 9 represent. So, the formula becomes

$\dfrac{9}{28}\times 100 = 0.32\overline{142857}\times 100 = 32.\overline{142857} \approx 32.14\%$

6 0

3 years ago

Solve 3x2 + 4x = 2<br>I need it solved with the quadratic formula

lisabon 2012 [21]

3x2+4x=2
6+4x=2
-6 -6
4x=-4
4 4
x=-1

8 0

3 years ago

Find the sum of the following ap .1) 1/15, 1/12, 1/10,....,to 11 terms​

Find the sum of the following ap .1) 1/15, 1/12, 1/10,....,to 11 terms