What does x2 + y2 equal.

Mathematics

1 answer:

Yuri [45]2 years ago

5 0

That’s the equation for the radius of a circle, it would equal r2

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JulijaS [17]

its b

Step-by-step explanation:

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2 years ago

The diagram shows a regular dodecagon work out the size of one interior angle

Aneli [31]

the diagram shows a regular dodecagon is the size of one interior angle

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2 years ago

A police department reports that the probabilities that 0, 1, 2, and 3 burglaries will be reported in a given day are 0.53, 0.40

SpyIntel [72]

The mean of the probability distribution is given by the expected value given by

$E(x)=\sum xp(x) \\ \\ =0(0.53)+1(0.40)+2(0.05)+3(0.02) \\ \\ =0.40+0.10+0.06=0.56$

The variance of the probability distribution is given by

$Var(x)=(x-\bar{x})^2p(x) \\ \\ =(0-0.56)^2(0.53)+(1-0.56)^2(0.40)+(2-0.56)^2(0.05)\\+(3-0.56)^2(0.02) \\ \\ =(-0.56)^2(0.53)+0.44^2(0.40)+1.44^2(0.05)+2.44^2(0.02) \\ \\ =0.3136(0.53)+0.1936(0.40)+2.0736(0.05)+5.9536(0.02) \\ \\ =0.166208+0.07744+0.10368+0.119072=0.4664$

The standard deviation is given by

$\sigma(x)=\sqrt{Var(x)} \\ \\ =\sqrt{0.4664}=0.683$

5 0

2 years ago

If a= (4,-5) and b= (7,-9), what is the length of ab

faust18 [17]

A (4,-5)
B (7,-9)

 $AB= \sqrt{(x_A-x_B)^2+(y_A-y_B)^2} \\ x_A=4; \ \ x_B=7; \ \ y_A=-5; \ \ y_B=-9; \\ \\ AB= \sqrt{(4-7)^2+(-5-(-9))^2}= \sqrt{(-3)^2+4^2} = \sqrt{25}=5$

5 0

3 years ago

Read 2 more answers

See the file below to see my question :)

RideAnS [48]

9514 1404 393

Answer:

a = 3
b = -18

Step-by-step explanation:

Using the least common denominator, we have ...

$2-\dfrac{x+1}{x-2}-\dfrac{x-4}{x+2}\\\\=\dfrac{2(x-2)(x+2)-(x+1)(x+2)-(x-4)(x-2)}{(x-2)(x+2)}\\\\=\dfrac{2(x^2-4)-(x^2+3x+2)-(x^2-6x+8)}{x^2-4}\\\\=\dfrac{(2-1-1)x^2+(-3+6)x+(-8-2-8)}{x^2-4}=\boxed{\dfrac{3x-18}{x^2-4}}$

The values of a and b are ...

a = 3

b = -18

3 0

3 years ago