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2 years ago

Can someone solve this

Mathematics

1 answer:

castortr0y [4]2 years ago

8 0

Answer:

Step-by-step explanation:

1/2 ^(-1)=2

8×2=16

Hope that helped.

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What is the cost of 2 kilograms of flour if 3 kilograms cost $4.86 and the unit price for each packages of flour is the same

Pavlova-9 [17]

The answer is: $3.24.

$\frac{4.86}{3} = \frac{x}{2}$
$\frac{9 .72}{3} = \frac{3x}{3}$
$3.24 = x$
so ye...

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3 years ago

In a population distribution, a score of x=57 corresponds to z=-0.25 and a score of x=87 corresponds to z=1.25. Find the mean an

Serggg [28]

Here is dependence between scores and x-values:

$Z_i=\dfrac{X_i-\mu}{\sigma},$

where $\mu$ is the mean, $\sigma$ is standard deviation and i changes from 1 to 2.

1. When i=1, $Z_1=-0.25,\ X_1=57,$ then

$-0.25=\dfrac{57-\mu}{\sigma}.$

2. When i=2, $Z_2=1.25,\ X_2=87,$ then

$1.25=\dfrac{87-\mu}{\sigma}.$

Now solve the system of equations:

$\left\{\begin{array}{l}-0.25=\dfrac{57-\mu}{\sigma}\\ \\1.25=\dfrac{87-\mu}{\sigma}.\end{array}\right.$

$\left\{\begin{array}{l}-0.25\sigma=57-\mu\\ \\1.25\sigma=87-\mu.\end{array}\right.$

Subtract first equation from the second:

$1.25\sigma-(-0.25\sigma)=87-57,\\ \\1.5\sigma=30,\\ \\\sigma=20.$

Then

$1.25=\dfrac{87-\mu}{20},\\ \\87-\mu=25,\\ \\\mu=87-25=62.$

Answer: the mean is 62, the standard deviation is 20.

3 0

3 years ago

Read 2 more answers

-4/9x-5/72x+1/8x= -56 please help me guys

geniusboy [140]

Answer:

$x=144$

Step-by-step explanation:

Therefore, $x=144$ should be your final answer.

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2 years ago

Which ordered pair is a solution to the system of equations?

tatyana61 [14]

2x - y = -2 . . . (1)
5x - 2y = -7 . . . (2)
From (1), y = 2x + 2 . . . (3)
Putting (3) into (2), gives:
5x - 2(2x + 2) = -7
5x - 4x - 4 = -7
x - 4 = -7
x = -7 + 4 = -3
y = 2(-3) + 2 = -6 + 2 = -4.

Therefore, the required answer is (-3, -4)

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3 years ago

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There are nine different types of bacteria on the Petri dish.

Olenka [21]

37 percent of the bacteria on the Petri dish is type 3

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