3 years ago

A circular plate has circumference 27.6 inches. What is the area of this plate?

Mathematics

1 answer:

jasenka [17]3 years ago

3 0

Answer: 86.70

Step-by-step explanation:

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karen purchased dvd 153.77 sale price the original price of dvd was 175.90 what is percent markd ou wn

Reptile [31]

Answer:

The price was marked down by 12.58%

Step-by-step explanation:

153.77 is a 12.581011938601% decrease of 175.90.

Percentage of decrease = |175.90 - 153.77|/175.90 = 22.13/175.90 = 0.12581011938601 = 12.581011938601%

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3 years ago

If cos x = −6/7, and 90° < x < 180°, what is cos⁡(2x)?

Naddik [55]

Recall the double angle identity:

$\cos2x=\cos^2x-\sin^2x=2\cos^2x-1$

Then

$\cos2x=2\left(-\dfrac67\right)^2-1=\dfrac{23}{49}$

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3 years ago

translate phrases into algebraic expressions, the difference between the cube of a number and the square of the number

Korolek [52]

Answer:

$x^3-x^2.$

Step-by-step explanation:

The word "difference" represents a subtraction. Then the algebraic expression will be of the form a-b.

Now, the difference is between the cube of a number and the square of the number, then let's call the number x. The square of the number is raise to two. Then the square of the number is $x^2$ .

The cube of the number is raise to three. Then the cube of the number is $x^3$ .

So, the difference between the cube of a number and the square of the number (we are talking about the same number in the square and the cube) is $x^3-x^2$ .