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3 years ago

PLEASE HELP ITS A TEST

Mathematics

1 answer:

Svet_ta [14]3 years ago

4 0

Answer:

Step-by-step explanation:

because i did that and got it right

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gtnhenbr [62]

Answer:

No, you should your best. Belivie in your self that you can do it.

Step-by-step explanation:

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3 years ago

Lea and Marie are washing all the windows in their house. It would take Lea 80 minutes to wash the windows by herself, and it wo

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Merhaba

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3 years ago

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Gena made 4 of her car payments late and was fined 4 late fees. The total in late fees were -$40. How much was one late fee?

svetlana [45]

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5 0

3 years ago

Which system of equations can be used to find the roots of the equation 4x^2=x^3+2x

Viktor [21]

The given equation is 4x^2=x^3+2x.

On the left side it has 4x² and on the right side the expression is x³+2x.

So, if we have any system of equations in which we have these two expression which will be equal to any other variable then we can use that system of equations to find the roots.

Now notice that in option D it's given,

y=4x² and y=x³+2x.

So, if we will equate this equations then we will get the same above equation which will be use to find the roots.

So, D is the correct choice.

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4 years ago

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A running shoe store mounts a new promotional campaign. Purchasers of new shoes may, if dissatisfied for any reason, return them

Vitek1552 [10]

Answer:

$P(K = k ) = \ ^nC_x * p^k * (1-p)^{n-k}$

Here k is the random number of number of pairs of shoes that will be returned for refund, which can be k = 0,1 ,2,3,4 ..., 120

The mean is $E(K) = np = 13.2$

The standard deviation is $\sigma = 3.43$

The mean is $E(C) = E(105 K) = 1386$

The standard deviation is $\sigma = 381.48$

Step-by-step explanation:

From the question we are told that

The cost to dealer for each refund is $C = \$105$

The probability that a shoe will refunded is $P(x) = 0.11$

The number of shoes purchased is n = 120 pairs

Generally the probability distribution of the number of pairs of shoes that will be returned for refunds is

$P(K = k ) = \ ^nC_x * p^k * (1-p)^{n-k}$

Here k is the random number of number of pairs of shoes that will be returned for refund, which can be k = 0,1 ,2,3,4 ..., 120

Generally the mean is mathematically represented as

$E(K) = np = 120 * 0.11$

=> $E(K) = np = 13.2$

Generally the standard deviation is mathematically represented as

$\sigma = \sqrt{ n* p (1-p)}$

=> $\sigma = \sqrt{ 120* 0.11 (1-0.11)}$

=> $\sigma = 3.43$

Generally the total refund cost is mathematically represented as

$C = 105 K$

Here K denotes the number of shoes returned

Generally the mean of the total refund cost is mathematically represented as

$E(C) = E(105 K) = 105 E(K)$

=> $E(C) = E(105 K) = 105 * 13.2$

=> $E(C) = E(105 K) = 1386$

Generally the variance of the total refund cost is mathematically represented as

$Var(K) = 105^2 * E(K)$

=> $Var(K) = 105^2 * 13.2$

=> $Var(K) = 145530$

=> $\sigma = \sqrt{145530 }$

=> $\sigma = 381.48$

7 0

3 years ago