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ale4655 [162]
3 years ago
9

The melting point of ice + common salt =​

Mathematics
2 answers:
lesya692 [45]3 years ago
6 0

Answer:

Step-by-step explanation:

Ice forms when the temperature of water reaches 32 degrees Fahrenheit (0 degrees Celsius). When you add salt, that temperature drops: A 10-percent salt solution freezes at 20 °F (-6 °C), and a 20-percent solution freezes at 2 °F (-16 °C). On a roadway, this means that if you sprinkle salt on the ice, you can melt it.

lorasvet [3.4K]3 years ago
4 0
Ice forms when temperatures are increased meaning it’ll be by 20 degrees
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For selected years, the national health care expenditure, in billion of dollors can be modelled by H=29.57e^0.0970t, remains acu
Sliva [168]

Answer:

The correct answer is 54.76 years.

Step-by-step explanation:

The national health care expenditure (H) , in billion of dollars is modeled by

H = 29.57 × e^{0.0970t}.

To measure the time before which national health expenditure reach 6000 billion dollars.

Thus putting the value of H = 6000 in the above modeled equation we get,

⇒ 6000 = 29.57 × e^{0.0970t}

⇒ \frac{6000}{29.57} = e^{0.0970t}

⇒ 202.908 = e^{0.0970t}

Taking logarithm with the base of e (㏑) both sides we get,

⇒ ㏑ 202.908 = ㏑ e^{0.0970t}

⇒ ㏑ 202.908 = 0.0970 × t

⇒ 0.0970 × t = 5.312

⇒ t = \frac{5.312}{0.0970}

⇒ t = 54.76.

Thus the total time required before which national health expenditure reach 6000 billion dollars is 54.76 years.

3 0
3 years ago
Sonya planted a flower garden of tulips, daisies and lilies. She planted 2 times as many tulips as daises and 3 tomes as many da
RideAnS [48]

70 flowers were planted in all.

Step-by-step explanation:

Let,

Tulips = t

Daises = d

Lilies = l

Total tulips planted = 42

She planted 2 times as many tulips as daises.

t=2d

Putting t=42

42=2d\\2d=42

Dividing both sides by 2

\frac{2d}{2}=\frac{42}{2}\\d=21

And 3 times as many daisies as lilies.

d=3l

Putting d=21

21=3l\\3l=21

Dividing both sides by 3

\frac{3l}{3}=\frac{21}{3}\\l=7

Total flowers planted = Tulips + Daisies + Lilies

Total flowers planted = 42 + 21 + 7 = 70

70 flowers were planted in all.

Keywords: division, addition

Learn more about addition at:

  • brainly.com/question/1349456
  • brainly.com/question/1357167

#LearnwithBrainly

3 0
3 years ago
Find the perimeter of this figure to the nearest hundreth use 3.14 as an approximate for pi​
maks197457 [2]

Answer: 40.56ft.

Step-by-step explanation:

First, lets find the perimeter of the half circle: c = 2pi(r)

pi = 3.14

r = 4

3.14 * 4 = 12.56

12.56 * 2 = 25.12

Then, because it is only have a circle, divide by 2.

25.12/2 = 12.56

10 + 10 + 8 + 12.56 = 40.56

5 0
3 years ago
Deborah needs to make 16 costumes for the school play. Each costume requires 2 and 1/4 yards of material. How many yards of mate
patriot [66]
35.5 wouldn’t be enough. She needs 2 1/4 of yards of material, first you would need to convert the fraction into a decimal and 1/4 is .25 which gives you 2.25 now you multiply 16 x 2.25 which gives you 36. That’s why 35.5 wouldn’t be enough.
3 0
3 years ago
A tank is filled with water at a rate of 2.4 liters per minute. At this rate, how
TEA [102]

Answer: 35 minutes

Step-by-step explanation:

84 liters divided by 2.4 liters per minute

84/2.4=35 minutes

4 0
3 years ago
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