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nikitadnepr [17]
3 years ago
10

Can someone help me

Mathematics
1 answer:
Hunter-Best [27]3 years ago
5 0

Answer:

cant help ask Google she always helps me

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A) If the 5th term of an A.P. is double the 7th term, show that the sum of the 17 terms zero.​
gayaneshka [121]

Answer:

see explanation

Step-by-step explanation:

The nth term of an AP is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Given a₅ is double a₇ , then

a₁ + 4d = 2(a₁ + 6d) , that is

a₁ + 4d = 2a₁ + 12d ( subtract a₁ from both sides )

4d = a₁ + 12d ( subtract 12d from both sides )

- 8d = a₁

The sum of n terms of an AP is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ] , substitute values

S_{17} = \frac{17}{2} ( 2(- 8d) + 16d)

     = 8.5(- 16d + 16d)

     = 8.5 × 0

     = 0

5 0
2 years ago
Does an angle bisector bisect the opposite angle of a triangle?
avanturin [10]

yes it does by ssa The angle bisector theorem is commonly used when the angle bisectors and side lengths are known. It can be used in a calculation or in a proof. An immediate consequence of the theorem is that the angle bisector of the vertex angle of an isosceles triangle will also bisect the opposite side.

4 0
3 years ago
4^2-2^3=?<br> a. 1/2<br> b.2<br> c. -128
alexandr402 [8]

Answer:

The answer to the question is 8

Step-by-step explanation:

6 0
3 years ago
Which equation, when graphed, has x-intercepts at (2, 0) and (4, 0) and a y-intercept of (0, –16)?
just olya [345]

Number 3 is the correct answer

Tell me if you want further explanation

5 0
3 years ago
Read 2 more answers
Pi · 7 = 7 · pi<br><br> What type of property is this equation?
maksim [4K]

Answer:

commutative property of multiplication

Step-by-step explanation:

the commutative property states that you can move the  variables around and it still wouldn't change the outcome of the problem.

hope this helps :)

6 0
3 years ago
Read 2 more answers
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