3 years ago

How do you find the sum of the first 20 terms of sequence

1 answer:

8 0

The formula to find the sum of the first n terms of our sequence is n divided by 2 times the sum of twice the beginning term, a, and the product of d, the common difference, and n minus 1. The n stands for the number of terms we are adding together.

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Helen [10]

Answer:

x=15

Step-by-step explanation:

You need to do proportions.

Since 16/12 = 1.3333333333333333333,

than you need to divide 20 by 1.323333333, so 20/1.3333333333333= 15

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3 years ago

What is the value of p?

aksik [14]

Answer:

P = 18

Step-by-step explanation:

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2 years ago

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Solve 9x^2- 17x- 85 = 0 Give your solutions correct to 3 significant figures.

dybincka [34]

Answer:

$x =\frac{17}{18} +\frac{1}{18} \sqrt{3349}$ OR $x =\frac{17}{18} +\frac{-1}{18} \sqrt{3349}$

Step-by-step explanation:

9x2−17x−85=0

For this equation: a=9, b=-17, c=-85

9x2+−17x+−85=0

Step 1: Use quadratic formula with a=9, b=-17, c=-85.

$x =\frac{-b + \sqrt{b^{2}-4ac } }{2a}$

$x =\frac{-(-17)+\sqrt{(-17)^{2} -4(9)(-85)} }{2(9)}$

$x =\frac{17}{18} +\frac{-1}{18} \sqrt{3349}$

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2 years ago

Write 2 9/10 as an improper fraction.<br><br>pls hurry!<br>and pls explain how to do it

stellarik [79]

Answer:

29/10

Step-by-step explanation:

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Terminos semejantes de -7a²(4a-3)

barxatty [35]

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