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3 years ago

11

The temperature on a Christmas morning was -7 degrees celsius. Three hours later the temperature dropped 5 degrees. Then by noon

, the temperature rose 9 degrees, but by night fall it dropped again 12 degrees. What was the temperature by night fall?

1 answer:

saul85 [17]3 years ago

7 0

Answer:

-15 degrees celsius

Step-by-step explanation:

-7 - 5 + 9 - 12 = - 12 - 3 = -15

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A triangle has sides with lengths of 64 kilometers, 80 kilometers, and 51 kilometers. Is it a right triangle?

dezoksy [38]

Step-by-step explanation:how

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3 years ago

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Hamburger is on sale for 20% off the normal $3.70 price. How much can you save per pound by buying the meat on sale? Explain you

Nitella [24]

Answer:

$0.75

Step-by-step explanation:

Given

Normal price - $3.70

If Hamburger is on sale for 20% off the normal price

The amount that can be saved will be 20% of $3.70

Amount that can be saved = 20/100 * 3.70

Amount that can be saved = 1/5 * 3.70

Amount that can be saved = 3.7/5

Amount that can be saved = 0.75

Hence the Amount that can be saved on $3.70 is $0.75

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2 years ago

Voltage sags and swells. The power quality of a transformer is measured by the quality of the voltage. Two causes of poor power

zysi [14]

Answer:

a

$z-score = 1.57$

b

$z-score_s = -3.36$

Step-by-step explanation:

From the question we are told that

The sample size is n = 103

The sample mean of sag is $\= x_1 = 353$

The sample mean of swells is $\= x_2 = 184$

The standard deviation of sag is $s_1 = 30$

The standard deviation of swells is $s_2 = 25$

The number of swell for a randomly selected transformer is k = 100

The number of sag for a randomly selected transformer is c = 400

Generally the z-score for the number of swells is mathematically represented as

$z-score_s = \frac{ k - \= x_2}{s_2}$

=> $z-score_s = \frac{ 100- 184}{25}$

=> $z-score_s = -3.36$

Generally the z-score for the number of sags is mathematically represented as

$z-score = \frac{ c - \= x_1}{s_1}$

$z-score = \frac{ 400 - 353}{30}$

$z-score = 1.57$

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3 years ago

Determine if the conclusion follows logically from the premises. Is this a valid or invalid argument?

Oksi-84 [34.3K]

Answer:

Valid Argument

Step-by-step explanation:

An argument is valid if its conclusion follows with certainty from its premises.

Given:

Premise: If it has an engine, I can fix it.

Premise: Cars have engines.

Conclusion: I can fix cars.

The argument is valid since the conclusion follows with certainty from the given premises.

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2 years ago

The angles of elevation froma point X to the top of flagpoles A and B are 35* and 45* respectively. If X lies in the middle of t

BartSMP [9]

Let AB = t. And since X lies in the middle, so AX=BX = t/2 .

Let the height of the smaller flagpole is AO and of larger flagpole is BP .

Using tangent ratio rule in each triangle, we will get

$tan 35 =\frac{AO}{t/2} , tan 45= \frac{BP}{t/2} // AO = \frac{t*tan35}{2}, BP=\frac{t*tan45}{2}$

And there ratio is

$\frac{AO}{BP}= \frac{tan 35}{tan 45}=\frac{0.7}{1}$

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2 years ago