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andriy [413]
2 years ago
5

Point A is at (-2,-7) and point M is at (2.5, -1.5).

Mathematics
1 answer:
algol [13]2 years ago
3 0

Answer:

B(7 , 4)

Step-by-step explanation:

(x₁ , y₁) = A(-2 , -7)

(x₂ , y₂) = Point B

Midpoint(5.5, -1.5)

Midpoint= (\frac{x_{1}+x_{2}}{2},\frac{y_{1}+y_{2}}{2})\\\\\\(\frac{-2+x_{2}}{2} , \frac{-7+y_{2}}{2} = (2.5 , -1.5)

Compare x-coordinates  & y-coordinates

\frac{-2+x_{2}}{2}=2.5     ;  \frac{-7+y_{2}}{2}=-1.5

-2+ x₂ = 2.5*2     ; -7+ y₂ = -1.5*2

-2+ x₂ = 5            ; -7 +y₂ = -3

    x₂ = 5 +2       ;        y₂ = -3 + 7

    x₂  = 7            ;        y₂ = 4

B(7 , 4)

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The first two terms in an arithmetic progression are -2 and 5. The last term in the progression is the only number in the progre
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Given:

The first two terms in an arithmetic progression are -2 and 5.

The last term in the progression is the only number in the progression that is greater than 200.

To find:

The sum of all the terms in the progression.

Solution:

We have,

First term : a=-2

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nth term of an A.P. is

a_n=a+(n-1)d

where, a is first term and d is common difference.

a_n=-2+(n-1)(7)

According to the equation, a_n>200.

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(n-1)(7)>200+2

(n-1)(7)>202

Divide both sides by 7.

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Add 1 on both sides.

n>29.857

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Sum of n terms of an A.P. is

S_n=\dfrac{n}{2}[2a+(n-1)d]

Substituting n=30, a=-2 and d=7, we get

S_{30}=\dfrac{30}{2}[2(-2)+(30-1)7]

S_{30}=15[-4+(29)7]

S_{30}=15[-4+203]

S_{30}=15(199)

S_{30}=2985

Therefore, the sum of all the terms in the progression is 2985.

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Step-by-step explanation:

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