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marusya05 [52]
3 years ago
12

Kyra observed that 85% of the students at a library liked reading mystery stories. If 30 students at the library did not like re

ading mystery stories, the number of students at the library who liked mystery stories was _____. (only put numeric values, no other symbols)
Mathematics
1 answer:
boyakko [2]3 years ago
8 0
First  calculate that numeric value. It cannot be done immediately without calculations.

if 85% of studends liked mystery that means that 100% - 85% = 15% didnt like.

Those 15% are 30 that were given in text. Now we can calculate this using proportion:

15%        30 students
85%         x students

we use cross multiplication:
15*x = 30*85
x = 30*85/15
x = 170

Answer is 170
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3 years ago
Professor Andrews found that as the number of days absent increases, students' grades decrease. Professor Andrews has found:
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Answer:

The function relating student absent days to grades has a negative slope (grades decrease as absences increase).

Step-by-step explanation:

There isn't much information in the question, but here are a couple of observations.  Prof. Andrews found:

  • The function relating student absent days to grades has a negative slope (grades decrease as absences increase).
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  • Students don't enjoy his class

Just kidding on the last 2, but all statements could be valid based on what little information is provided.

3 0
2 years ago
To maintain essential electricity, a gasoline generator at a Puerto Rico hospital uses 3 gallons of gasoline per hour. a) How ma
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The mass of the CO2 produced IS 630 Kg

<h3>What is gasoline?</h3>

Gasoline is a kind of fuel that is composed mostly of isooctane. In most engines, gasoline is widely used hence the demand for the product is high. We know that the combustion of an alkane (of which gasoline is one) would produce carbon dioxide and water according to a balanced reaction equation.

The balanced reaction equation for the combustion of gasoline is shown in the image attached to this answer.

Since  a Puerto Rico hospital uses 3 gallons of gasoline per hour, and there are 24 hours in a day, it the follows that 72 gallons of gasoline are used per day. This 72 gallons is the equivalent of 272.88 L

Now;

Given that the density of gasoline = 748.9 g/L

Mass of gasoline = 748.9 g/L * 272.88 L = 204 Kg

Number of moles of gasoline =  204 * 10^3/114 g/mol = 1789.5 moles

If 2 moles of gasoline produces 16 moles of CO2

1789.5 moles produces  1789.5 moles * 16 moles/2 moles = 14316 moles

Mass of CO2 =  14316 moles * 44 g/mol = 630 Kg

Learn more about gasoline:brainly.com/question/13402652?

#SPJ1

4 0
2 years ago
the cost of circular mirrors is directly proportional to the square of the diameter. a circular mirror with a diameter of 60cm c
defon
When 'y' is directly proportional to 'x', we express this by

y = kx

where 'k' is the constant, which we need to work out first

Cost of circular mirrors = (k) (diameter)²
50 = k(60)²
50 ÷ 3600 = k 

the proportional formula is

y = (1/72)x²

The cost of the mirror when diameter = 90cm

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Answer: $112.50

6 0
3 years ago
Round 367.566 to the nearest tenth
cricket20 [7]

Answer:

367.6

Step-by-step explanation:

Hope this helps!

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