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Oksanka [162]
3 years ago
9

Plz help this is my last math question I need help with!​

Mathematics
2 answers:
charle [14.2K]3 years ago
8 0

Answer:

He buys 8 desks and 6 chairs can i have branliest

Step-by-step explanation:

Set up a system of equations

desks = y chairs = x

x+y=14

125x + 515y = 4870

Eliminate,

-125x -125y = -1750

125x + 515 y = 4870

390 y = 3120

y = 8

substitute in 8

x + 8 = 14

x = 6

gizmo_the_mogwai [7]3 years ago
5 0

Answer:

Step-by-step explanation:

Let number of chairs be x and number of desks be y

Total number of chairs and desks = 14

x + y = 14   --------------(i)

Total cost  = $ 4870

125x + 515y = 4870 ------------(ii)

Multiply equation (i) by (-125).

(i)*(-125)          -125x - 125y = -1750

(ii)                    <u>125x +515y = 4870</u>    {Now add}

                                  390y = 3120

y = 3120/390

y = 8

Plug in value of y in equation 1

x + 8 = 14

x = 14 - 8

x = 6

Number of chairs = 6

Number  of desks  = 8

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3 years ago
Find the value of w-9 given that –3w+5 = 2
melamori03 [73]

Answer:

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Step-by-step explanation:

Solving for w given the equation, -3w +5 = 2:

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Solving for w -9 when w = 1

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3 0
2 years ago
In an article about the cost of health care, Money magazine reported that a visit to a hospital emergency room for something as
baherus [9]

Answer:

Probability that the cost will be less than $500 is 0.95994 .

Step-by-step explanation:

We are given that Money magazine reported that a visit to a hospital emergency room for something as simple as a sore throat has a mean cost of $348 with a standard deviation of $87.

Let X = cost of a hospital emergency room visit for this medical service

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The standard normal z score distribution is given by;

              Z = \frac{X-\mu}{\sigma} ~ N(0,1)

(a) Probability that the cost will be less than $500 = P(X < $500)

    P(X < 500) = P( \frac{X-\mu}{\sigma} < \frac{500-348}{87} ) = P(Z < 1.75) = 0.95994 {from z table}

Therefore, the probability that the cost will be less than $500 is 0.95994 .

                                               

3 0
3 years ago
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nevsk [136]

Answer:

b

Step-by-step explanation:

the answer is b

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2 years ago
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Vanyuwa [196]

A

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3 0
2 years ago
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