All categories

3 years ago

Write the standard equation of a circle with center (-9,-4) and radius 15.

Mathematics

1 answer:

Oksi-84 [34.3K]3 years ago

5 0

Answer:

Equation of a circle:

radius = the sq. rt of (x - h)^2 + (y - k)^2

Plug in the values for the center of a circle and the radius:

15 = the sq. rt of (x + 9)^2 + (y + 4)^2

(x + 9)^2 + (y + 4)^2 = 225

The answer is A or the first one.

You might be interested in

Steve's doctor has advised him to take protein supplements. He bought two brands, Brand A and Brand B. The table gives the amoun

BlackZzzverrR [31]

Here s the question this is the doc i put it on please help

Download docx

6 0

3 years ago

The number of pens used varies directly with the number of pieces of paper needed. If 12 pens are used when 40 pieces of paper a

svetlana [45]

Answer:

Step-by-step explanation:

Y=KX

P=KX

12=K40

12/40=K

.3=K

P=.3X

P=.3(240)

P=72

6 0

2 years ago

For a one-tailed test with a = .05 and a sample of n = 9, the critical value for the t statistic is t = 1.860.

ahrayia [7]

I think its B. False if im wrong sorry hope this helped tho :p

6 0

2 years ago

Can someone help me

Lemur [1.5K]

Multiplying fractions is just multiplying the numerators together and the denominators together.

$\sf\dfrac{4}{7}\times\dfrac{1}{4}\rightarrow\dfrac{4\times 1}{7\times 4}\rightarrow\dfrac{4}{28}\rightarrow\dfrac{1}{7}$

$\sf\dfrac{4}{7}\times\dfrac{1}{6}\rightarrow\dfrac{4\times 1}{7\times 6}\rightarrow\dfrac{4}{42}\rightarrow\dfrac{2}{21}$

To find out which one is bigger, we need a common denominator. The LCM of 7 and 21 is 21, so convert the first fraction into a denominator of 21. 7 goes into 21 three times, multiply this to the numerator and denominator:

$\sf\dfrac{1}{7}\rightarrow\dfrac{1\times 3}{7 \times 3}\rightarrow\dfrac{3}{21}$

Now just compare the numerators to see which one is bigger.

$\sf\dfrac{3}{21}>\dfrac{2}{21}$ therefore, $\sf\dfrac{4}{7}\times\dfrac{1}{4}>\dfrac{4}{7}\times\dfrac{1}{6}$

5 0

3 years ago

URGENT. Find f(3) if<br> f(x)=x^3 + 2x^2-x-1

KonstantinChe [14]

Answer:

Step-by-step explanation:

Jus replace x with 3 and put it in a calculator.

6 0

2 years ago

Read 2 more answers