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lisov135 [29]
3 years ago
14

Prove that: Cos2pi/7+cos4pi/7+cos8pi/7=-1/2

Mathematics
1 answer:
Anna007 [38]3 years ago
8 0

Answer:

1. use a calculator to help

2. that's wrong because it equals 1.333...

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What is the equation of this line in slope-intercept form?
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Answer:

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Step-by-step explanation:

Slope-intercept form: y = mx + b

The slope of the line, m, is -2 because the line shows a negative trend and moves right 1 unit every time a point moves down 2 units.

The y-intercept, b, is 5 because the line crosses that number once on the y-axis.

7 0
2 years ago
What is 0.00837 written in scientific notation?
Angelina_Jolie [31]

Answer:

8.37 x 10^-3

(Scientific Notation)

 

8.37 x 10^-3

(use the caret symbol [^] to type or write)

8.37E-3

(Scientific E-notation)

0.00837

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Step-by-step explanation:

How to convert numbers or decimals to scientific notation?

In scientific notation all numbers are written in the form of m×10n (m times ten raised to the power of n), where the exponent n is an integer, and the coefficient m is any real number, called the significand or mantissa. If the number is negative then a minus sign precedes m (as in ordinary decimal notation).

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4 years ago
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emmainna [20.7K]

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