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3 years ago

How to answer this question, please I need steps

Mathematics

1 answer:

crimeas [40]3 years ago

5 0

Answer:

Step-by-step explanation:

We require 2 equations in 2 variables

let x be the number of salads sold and y the number of drinks sold, then the 2 equations are

x + y = 209 → (1)

6.5x + 2y = 836.5 → (2)

Multiplying (1) by - 2 and adding to (2) will eliminate y

- 2x - 2y = - 418 → (3)

Add (2) and (3) term by term

(6.5x - 2x) + (2y - 2y) = (836.5 - 418) ← simplify

4.5x = 418.5 ( divide both sides by 4.5 )

x = 93

The number of salads sold was 93

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In a recent year, a sample of grade 8 Washington State public school students taking a mathematics assessment test had a mean sc

Daniel [21]

Answer:

The number is $N =1147$ students

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 281$

The standard deviation is $\sigma = 34.4$

The sample size is n = 2000

percentage of the would you expect to have a score between 250 and 305 is mathematically represented as

$P(250 < X < 305 ) = P(\frac{ 250 - 281}{34.4 } < \frac{X - \mu }{\sigma } < \frac{ 305 - 281}{34.4 } )$

Generally

$\frac{X - \mu }{\sigma } = Z (Standardized \ value \ of \ X )$

$P(250 < X < 305 ) = P(-0.9012< Z$

$P(250 < X < 305 ) = P(z_2 < 0.698 ) - P(z_1 < -0.9012)$

From the z table the value of $P( z_2 < 0.698) = 0.75741$

and $P(z_1 < -0.9012) = 0.18374$

$P(250 < X < 305 ) = 0.75741 - 0.18374$

$P(250 < X < 305 ) = 0.57$

The percentage is $P(250 < X < 305 ) = 57\%$

The number of students that will get this score is

$N = 2000 * 0.57$

$N =1147$

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3 years ago

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Tamiku [17]

The minimum of this graph is the focus of the parabola. I'm not sure with the maximum though but I think it doesn't have a maximum because the y value of the parabola will extend infinitely upward.

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4 years ago

jordan is cutting a 2 m by 1 1/4 m piece of rectangular paper into two pieces along its diagonal. find the area of each of the p

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Answer:

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Step-by-step explanation:

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2 years ago

Using the given points and line, determine the slope of the line. (-3, 0) and (2, 7)

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Slope for (x₁, y₁) and (x₂, y₂): (-3, 0) and (2, 7)

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<span>Slope = 7/5
</span>

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3 years ago

Quick!!.

elena-14-01-66 [18.8K]

2 x 1/4 is the same as 1/4 + 1/4

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3 years ago

Read 2 more answers

How to answer this question, please I need steps​

How to answer this question, please I need steps