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3 years ago

PLEASE HELP .!!! ILL GIVE BRAINLIEST.. EXRTA POINTS .. DONT SKIP :(( ! ILL GIVE 40 POINTS .

Mathematics

1 answer:

alexira [117]3 years ago

4 0

Answer:

x=1 y=2.5

Step-by-step explanation:

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What is 4768in expanded notation as the sum of multipacation expressions using the power of 10

vova2212 [387]

the answer is
4.7 × 10^3. .

6 0

3 years ago

2 feet to 2 yards ratio

vredina [299]

Answer:

$\frac{1}{3}$

Step-by-step explanation:

Three feet make a yard, so 2 yards is 6 feet

$\frac{2}{6}$ If we divide the top (numerator) and the bottom (denominator) by 2 we get

$\frac{2}{6}$ ÷ $\frac{2}{2}$ = $\frac{1}{3}$

8 0

1 year ago

Let X be a normal random variable with mean 3 and variance 4. (a) Find the probability P(2 < X < 6). (b) Find the value c

Vanyuwa [196]

Answer:

a) the probability of (2 < X < 6) is 0.6247

b) the value of c is 3.878

c) the value of E[ x² ] is 13

Step-by-step explanation:

Given that;

mean μ = 3

variance = 4

standard deviation s = √variance = √4 = 2

(a) Find the probability P(2 < X < 6)

P(2 < X < 6) = p( (x - μ / s ) < z < (x - μ / s ) )

= p( (2 - 3 / 2 ) < z < (6 - 3 / 2 ) )

= p( -0.5 < z < 1.5)

from z-score table, 1.5; z = 0.9332 and -0.5; z = 0.3085

P(2 < X < 6) = 0.9332 - 0.3085 = 0.6247

Therefore, the probability of (2 < X < 6) is 0.6247

b) Find the value c such that P(X > c) = 0.33

with p-value = 0.33, the corresponding z -score to the right is 0.439

we know that;

z = x - μ / s

we substitute

0.439 = x - 3 / 2

x - 3 = 2 × 0.439

x - 3 = 0.878

x = 0.878 + 3

x = 3.878

Therefore, the value of c is 3.878

c) Find E[ x² ].

Variance = E[ x² ] - [ mean ]²

E[ x² ] = Variance + [ mean ]²

we substitute

E[ x² ] = 4 + [ 3 ]²

E[ x² ] = 4 + 9

E[ x² ] = 13

Therefore, the value of E[ x² ] is 13

4 0

3 years ago

What type of conic is given by the equation 4x^2+9y^2=36

zvonat [6]

Answer:

This is equation of ellipse

Step-by-step explanation:

we are given

$4x^2+9y^2=36$

We can see that right side is 36

so, we can make right side as 1 by dividing both sides by 36

$\frac{4x^2+9y^2}{36} =\frac{36}{36}$

$\frac{4x^2+9y^2}{36} =1$

$\frac{4x^2}{36}+\frac{9y^2}{36} =1$

we can simplify it

$\frac{x^2}{9}+\frac{y^2}{4} =1$

we can rewrite it as

$\frac{x^2}{3^2}+\frac{y^2}{2^2} =1$

now, we can compare it with standard equation of ellipse

$\frac{(x-h)^2}{a^2}+\frac{(y-k)^2}{b^2} =1$

we can see that both equations are similar

so, this is equation of ellipse

8 0

3 years ago

Plsssss HELP me my exam is tomorrow

Charra [1.4K]

Answer:

Step-by-step explanation:

$\sqrt{3} * \sqrt{12} = \sqrt{3} * \sqrt{4} * \sqrt{3}\\\sqrt{4} = \sqrt{2*2} = 2\\\\$

Therefore, $\sqrt{3} * \sqrt{4} * \sqrt{3} = \sqrt{3} * 2 * \sqrt{3}\\\sqrt{3} * \sqrt{3} * 2 = 3 * 2 = 6$

6 0

3 years ago

PLEASE HELP .!!! ILL GIVE BRAINLIEST.. *EXRTA POINTS* .. DONT SKIP :(( ! ILL GIVE 40 POINTS .

PLEASE HELP .!!! ILL GIVE BRAINLIEST.. EXRTA POINTS .. DONT SKIP :(( ! ILL GIVE 40 POINTS .