What is the summation notation for the series? 200+175+150+125++(-300)

Sum notation will be

Step-by-step explanation:

The given series is 200 + 175 + 150 + 125........+(-300)

Here

a = 200

d = -25

T(n) = -300

Therefore from the equation

-300 = 200 + (n-1)(-25)

200 -25n + 25 = -300

225 - 25n = -300

-25n = -300 - 225 = -525

n = (-525)/(-25) = 21

Now

Now the notation will be

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

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18. g

20. h 30 degree turn.

21. d 90 degree angles

and also 19 is a. a sphere not a cirlcle

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