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3 years ago

Please help me !!!

Mathematics

1 answer:

Kryger [21]3 years ago

4 0

Primcipal 739.30 Total = 778.90

Found by trial and error. I tried using equations but when you have TWO unknowns, it's (I think) impossible.

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15−7×2+2×2×2 pls answer

Makovka662 [10]

Answer:

The answer to this question is 9

Step-by-step explanation:

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2 years ago

Which of the following are the subset of ,B={1,2,3,4,5,6,7,8,9,10}.

Verdich [7]

Answer:

A, C, T

Step-by-step explanation:

A subset simply means a set of which all of its elements are contained in a larger set :

To obtain the subsets of B={1,2,3,4,5,6,7,8,9,10}.

We observe the smaller sets whose entire elements can be found in B

D={0,2,4,6,8,10,12} = not a subset of B ; B does not contain 0

A={5,6,7} = subset of B, all elements Cann be found in B

C={2} = subsets of B, 2 can be found in B

T={1,2,3,4,5,...,8} = subset of B; all elements can be found in B

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2 years ago

Please help me with the question

mars1129 [50]

(i) The mean is

$\displaystyle E(X) = \sum_x x \, P(X = x) \\\\ E(X) = 1\cdot0.175 + 2\cdot0.315 + 3\cdot0.211 + 4\cdot0.092 + 5\cdot0.207 \\\\ \boxed{E(X) = 2.839}$

The variance is

$V(X) = E((X - E(X))^2) = E(X^2) - E(X)^2$

Compute the second moment $E(X^2)$ :

$\displaystyle E(X^2) = \sum_x x^2 \, P(X = x) \\\\ E(X) = 1^2\cdot0.175 + 2^2\cdot0.315 + 3^2\times0.211 + 4^2\times0.092 + 5^2\times0.207 \\\\ E(X^2) = 9.997$

Then the variance is

$\boxed{V(X) \approx 1.9171}$

(ii) For a random variable $Z=aX+b$ , where $a,b$ are constants, we have

$E(Z) = E(aX+b) = E(aX) + E(b) = a E(X) + b$

and

$V(Z) = E((aX+b)^2) - E(aX+b)^2 \\\\ V(Z) = E(a^2 X^2 + 2ab X + b^2) - (a E(X) + b)^2 \\\\ V(Z) = a^2 (E(X^2) - E(X)^2) \\\\ V(Z) = a^2 V(X)$

Then for $Y=\frac{X+3}2$ , we have

$E(Y) = \dfrac12 E(X) + \dfrac32 \\\\ \boxed{E(Y) = 2.918}$

$E(Y^2) = E\left(\left(\dfrac{X+3}2\right)^2\right) = \dfrac14 E(X^2) + \dfrac32 E(X) + \dfrac94 \\\\ \boxed{E(Y^2) \approx 9.0028}$

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2 years ago

What is y=1/2x+3 and y=-3/2x+7

goblinko [34]

Answer:

Graph for 0.5*x+3, (‑3)/(2*x)+7

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3 years ago

There are 40 students in the 6th grade at Garden Valley Middle School. Eight of them have freckles. What is the ratio of 6th gra

sweet-ann [11.9K]

The answer is 8:40 i believe

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3 years ago

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