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3 years ago

Toby began making a grilled cheese sandwich at 1:48 P.M. The sandwich was ready at

Mathematics

2 answers:

Doss [256]3 years ago

7 0

Answer:

5 minutes he took to grill the sandwich

KonstantinChe [14]3 years ago

6 0

Answer:

5 mins

Step-by-step explanation:

53-48=5

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A certain car model has a mean gas mileage of 34 miles per gallon (mpg) with a standard deviation A pizza delivery company buys

zubka84 [21]

Answer:

$z =\frac{33.3- 34}{\frac{5}{\sqrt{54}}}= -1.028$

$z =\frac{34.3- 34}{\frac{5}{\sqrt{54}}}= 0.441$

An we can use the normal standard table and the following difference and we got this result:

$P(-1.028$

Step-by-step explanation:

Assuming this statement to complete the problem "with a standard deviation 5 mpg"

We have the following info given:

$\mu = 34$ represent the mean

$\sigma= 5$ represent the deviation

We have a sample size of n = 54 and we want to find this probability:

$P(33.3 < \bar X< 34.3)$

And for this case since the sample size is large enough >30 we can apply the central limit theorem and then we can use this distribution:

$\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})$

And we can use the z score formula given by:

$z=\frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And replacing we got:

$z =\frac{33.3- 34}{\frac{5}{\sqrt{54}}}= -1.028$

$z =\frac{34.3- 34}{\frac{5}{\sqrt{54}}}= 0.441$

An we can use the normal standard table and the following difference and we got this result:

$P(-1.028$

7 0

4 years ago

The straight line joining the points A(3,-5) and B(6,k) has a gradient of 4. Work out the value of k.

BaLLatris [955]

The straight line joining the points A(3,-5) and B(6,k) has a gradient of 4.

Gradient is the slope

So the slope of the line joining the points A(3,-5) and B(6,k) is 4

Slope of line joining two points = $\frac{y_2-y_1}{x_2-x_1}$

A(3,-5) and B(6,k) are (x1,y1) and (x2,y2)

slope = $\frac{y_2-y_1}{x_2-x_1}$

slope = $\frac{k-(-5)}{6-3}=\frac{k+5)}{3}$

We know slope =4

$\frac{k+5)}{3}=4$

Cross multiply and solve for k

k + 5 = 12

k = 7

The value of k = 7

7 0

3 years ago

What is this? Please answer with an explanation

Pie

Answer:

Step-by-step explanation:

1. in order to calculate all the required values, it needed to solve:

$\sqrt{x-5} \geq 0; \ \ x\geq 5.$

2. x≥5 means, that x∈[5;+∞), where beginnig is '5'.

3 0

3 years ago

In a sequence the first term is 7 and the common difference is 2 what is the fifth term

Nady [450]

7, 14, 28, 56, 112.

The 5th term is 112

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3 years ago

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What is the square roots of 9

Lyrx [107]

Answer:

(x-3) and (x+3) I think

Step-by-step explanation:

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3 years ago

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