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OverLord2011 [107]
3 years ago
9

The center of the circle whose equation is (x + 2)² + (y - 3)² = 25 is

Mathematics
1 answer:
joja [24]3 years ago
4 0

Answer:

Step-by-step explanation:

center: (-2,3)

Radius: 5

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Answer:

None of the above

Step-by-step explanation:

-9 tells the distance between her hand and the keys

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3 years ago
Solve the Law of Cosine: c^2 = a^2+ b^2 - 2abcosC for cos C.
Andrew [12]

Answer:

The Law of Cosine :  cos C = \frac{a^{2}+ b^{2}-c^{2}}{2ab}

Step-by-step explanation:

See the figure to understand the proof :

Let A Triangle ABC with sides a,b,c,

Draw a perpendicular on base AC of height H meet at point D

Divide base length b as AD = x -b   and    CD = x

By Pythagoras Theorem

In Triangle BDC             And     In Triangle BDA

a² = h² + x²     (  1  )                        c² = h² + (x-b)²

                                                      c² = h² + x² + b² - 2xb   ...(. 2)

From above eq 1 and 2

c² = (a² - x²) + x² + b² - 2xb

or, c² = a² + b² - 2xb                    .....(3)

Again in ΔBDC

cos C = \frac{BD}{BC}

Or, cos C = \frac{x}{a}

∴ x= a cos C

Now put ht value of x in eq 3

I.e, c² = a² + b² - 2ab cos C

Hence , cos C = \frac{a^{2}+ b^{2}-c^{2}}{2ab}      Proved   Answer

6 0
3 years ago
Helppppppp i need help
Lunna [17]
Do you need the fraction? I don’t understand what you are asking
8 0
3 years ago
P.1.3b Four candy stores are competing with each other. Which store offers the best buy for candy? A.) Sweet Store: 12 pack for
marin [14]

Answer:

c

Step-by-step explanation:

3 0
3 years ago
Oliva has a job as a writer, she writes 2 new sheets of magazines for her job in 3 hours. What is the rate per hour at she write
elena-14-01-66 [18.8K]

Answer:

2/3 magazines per hour

Step-by-step explanation:

Olivia writes 2 new sheets of magazines in 3 hours.

The rate per hour at with she writes the sheets of magazines is the number of sheets divided by the amount of time taken to write the sheets.

Hence, the rate per hour is:

R = 2 / 3 = 2/3 magazines per hour

The rate per hour at with she writes the sheets of magazines is 2/3 magazines per hour.

4 0
3 years ago
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