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3 years ago

11

Amtrak trains from Chicago to Portland arrived at Havre, MT, where they make a crew change, the following numbers of minutes lat

e: 26, 17, 245, 19, 38, 42, 11, 0, 14, 44 Find the mean number of minutes late at Havre (to one decimal place).

1 answer:

arsen [322]3 years ago

6 0

Answer:

45.6 min

Step-by-step explanation:

(26+17+245+19+38+42+11+0+14+44) / 10 = 456 / 10 = 45.6

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After a 60% reduction, you purchase a new sofa drink machine on sale for $312.

Varvara68 [4.7K]

Search up 0.60 x 312= 187.2, 187.2 + 312 = 499.2

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2 years ago

Question 1- explain how Sheldon immediately knew howard was incorrect?

Dmitrij [34]

Answer:

Part 1) In the procedure

Part 2) In the procedure

Step-by-step explanation:

Part 1) Observing the graph

The roots are x=-1/2 and x=4

Remember that, the roots are the x-values when the value of y is equal to zero (the x-intercepts)

That's why Sheldon immediately realizes Howard's solution is incorrect

Part 2) we have

$y=2x^{2}-7x-4$

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

equate the equation to zero

$2x^{2}-7x-4=0$

so

$a=2\\b=-7\\c=-4$

substitute

$x=\frac{-(-7)(+/-)\sqrt{-7^{2}-4(2)(-4)}} {2(2)}$

$x=\frac{7(+/-)\sqrt{49+32}} {4}$

Howard's error is in this step, is wrong with the sign of the number 7, is positive instead of negative

$x=\frac{7(+/-)\sqrt{81}}{4}$

$x=\frac{7(+/-)9}{4}$

$x=\frac{7(+)9}{4}=4$

$x=\frac{7(-)9}{4}=-1/2$

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3 years ago

Find an irrational number that is between 7.7 and 7.9. Explain why it is irrational. Include the decimal approximation of the ir

Radda [10]

The irrational number is 7.8. It is irrational because it does not terminate or repeat

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3 years ago

Jason inherited a piece of land from his great-uncle. Owners in the area claim that there is a 45% chance that the land has oil.

Alik [6]

0.45*0.2= 0.09
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8 0

3 years ago

Read 2 more answers

The rate of change in the temperature T of coffee at time t is proportional to the difference between the temperature M of the a

Anna11 [10]

Answer:

$T'(t)=k(M(t)-T(t))$

Step-by-step explanation:

The rate of change in the temperature T of coffee at time t is written as $T'(t)$ (remember derivatives are used to express rates of change, and in our case the rate of change of the temperature T). The difference between the temperature M of the air at time t, and the temperature T of the coffee at time t can be expressed as $M(t)-T(t)$

Saying that the rate of change in the temperature T is proportional to the difference between M and T is just a way of saying that the rate of change in the temperature T is equal to the difference between M and T, multiplied by some constant k (whose value we don't know, but still that's what it means).

Therefore we get

$T'(t)=k(M(t)-T(t))$

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3 years ago