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3 years ago

Please help now 100 million coins

Mathematics

1 answer:

Montano1993 [528]3 years ago

7 0

There are 12 total sections, of which 3 are blue. So the probability of spinning a blue is 3/12 which reduces to 1/4.

Each spin is independent.....because 1 spin does not effect the other spin. If u should spin a blue on the first spin...this does not effect what ur second spin will land on

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Please show your work.<br> 8 times (4+5+7) <br> (2 plus 3) times ( 11-5)

emmainna [20.7K]

Answer:

3840

Step-by-step explanation:

8×(4+5+7)(2+3)×(11-5)

8×(16)(5)×(6)

128(5)×(6)

640×6=3840

I think this is the answer but I am confused about the equation. :)

4 0

3 years ago

1. Identify the centers and radii of the following circles.

vlada-n [284]

Answer:

a) $(-25,0)\, ,r=1$

b) $(-1,4)\, ,r=3$

c) $(10,5)\, ,r=10$

d) $(0,0)\, ,r=\sqrt{19}$

e) $(-\frac{1}{2},-\frac{1}{2})\, ,r = \dfrac{1}{2}$

Step-by-step explanation:

the general equation of a circle is can be represented in two forms

$(x-a)^2+(y-b)^2=r^2$

here,

the centre is: $(a,b)$

radius is: $r$

$x^{2}+y^{2}+2gx+2fy+c=0$

here,

the centre is: $(-g,-f)$

radius is: $\sqrt{g^2 + f^2 -c}$

Given these two forms we can solve the questions:

a) $(x+25)^2+y^2=1$

this resembles the first equation of the circle hence we can compare them.

for center: we can see that +25 is the place of '-a', there is nothing in the place of b.

$-a = 25$ solve for a

$a = -25$

similarly,

$b = 0$

the center is $(a,b) = (-25,0)$

for radius:

$r^2 = 1$

$r = \sqrt{1}$

$r = 1$ , we'll not take '-1' since that negative numbers don't apply to lengths.

b) $x^2+2x+y^2-8y=8$

we can clearly see that this resembles the second general equation. Hence by comparison we can find +2x is in the place of +2gx, and solve for g.

$+2gx=+2x$

$g=1$

similarly

$+2fy=-8y$

$f=-4$

the centre of the circle is denoted by $(-g,-f) = (-1,4)$

for radius:

$r = \sqrt{g^2 + f^2 -c}$

side note: the value of 'c' can be found if we simply move 8 from the right hand side of the equation to the left. $x^2+2x+y^2-8y-8=0$

$r = \sqrt{1^2 + (-4)^2 -(-8)}$

$r = \sqrt{9}$

$r = 3$

c) $x^2-20x+y^2-10y+25=0$

we'll do these in the same manner as (b)

$+2gx=-20x$

$g=-10$

$+2fy=-10y$

$f=-5$

the centre of the circle is denoted by $(-g,-f) = (10,5)$

for radius:

$r = \sqrt{g^2 + f^2 -c}$

$r = \sqrt{(-10)^2 + (-5)^2 -25}$

$r = 10$

d) $x^2+y^2=19$

this is easy in the sense that both general equations apply here. We can either say since there is no 2gx and 2fy term, both g and f are zeros hence the centre is (0,0)

or we can also say there's no 'a' and 'b', hence the centre is (0,0).

the centre is: $(a,b) = (-g,-f) = (0,0)$

the radius can also be found through any of the two equations, but to keep it short we'll just use:

$r^2 = 19$

$r = \sqrt(19)$

e) $x^2+x+y^2+y=-1/4$

this is one is again similar to the second equation.

for centre:

$+2gx = x$

$g = \dfrac{1}{2}$

$+2fy = y$

$f = \dfrac{1}{2}$

the centre of the circle is denoted by $(-g,-f) = (-\frac{1}{2},-\frac{1}{2})$

for radius:

$r = \sqrt{g^2 + f^2 -c}$

$r = \sqrt{\left(\dfrac{1}{2}\right)^2 + \left(\dfrac{1}{2}\right)^2 -\left(\dfrac{1}{4}\right)}$

$r = \sqrt{\dfrac{1}{4}\right}$

$r = \dfrac{1}{2}$

5 0

3 years ago

Countries need the right resources to create products. Which of the following factors is NOT a resource that a country

Nuetrik [128]

Answer:

C. Having a low standard of living.

Step-by-step explanation:

It's not a resource that a country might need in order to produce something to trade. There is not a country that would need a low standard of living to produce goods to trade. It's not a resource too.

8 0

3 years ago

Plz helpppppppp its mathhh

just olya [345]

Answer:

a) 24

b) average kinetic E = 4

Step-by-step explanation:

Step 1:

we have 2 molecules = 5 kinetic E

2 moleules = 4 kinetic E

2 molecules = 3 kintec E

adding all of these up gives us the value of 24

Step 2:

average = the kintetic E of 3 values / how many different values there are which is 3

(3+4+5) / 3 = 4

Thus, the average kinetic E is 4

4 0

4 years ago

Read 2 more answers

Purchases made at small "corner stores" were studied by the authors of a certain paper. Corner stores were defined as stores tha

zvonat [6]

Answer:

a) 0.059

b) 0.579

c) 0.211

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 21.6 grams

Standard Deviation, σ = 6 grams

We are given that the distribution of grams of fat in a corner store purchase is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(purchase has more than 31 grams of fat)

P(x > 31)

$P( x > 31) = P( z > \displaystyle\frac{31 - 21.6}{6}) = P(z > 1.567)$

$= 1 - P(z \leq 1.567)$

Calculation the value from standard normal z table, we have,

$P(x > 31) = 1 - 0.941 = 0.059 = 5.9\%$

b) P(corner store purchase has between 15 and 25 grams of fat)

$P(15 \leq x \leq 25) = P(\displaystyle\frac{15 - 21.6}{6} \leq z \leq \displaystyle\frac{25-21.6}{6}) = P(-1.1 \leq z \leq 0.567)\\\\= P(z \leq 0.567) - P(z < -1.1)\\= 0.715 - 0.136 = 0.579 = 57.9\%$