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Aleonysh [2.5K]
3 years ago
13

A student earned 37 out of 50 points on the last test. What percent correct did the student earn?

Mathematics
2 answers:
garri49 [273]3 years ago
6 0
Percent = part / whole * 100

% correct = 37/50 * 100 = 74%
saw5 [17]3 years ago
4 0
The answer is:  " 74% " .
_____________________
% = percent = parts per 100 = x/ 100 ;

37/50 = x/100 ; 

Looking at the denominators; 

50 * (what value?) = 100 ?

→ 100 ÷ 50 = 2 ; 

So;  50 * 2 = 100 ;

So;  37/50 = (37*2) / (50*2) = 74/100 = 74 % .
_______________________________________
The answer is:  " 74% " .
_______________________________________
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A famous painting was purchased for $560,000 in the year 2021. The value has been increasing by $8,000 per year.
yarga [219]

The price of a painting in the year 2022 will be $ 568,000.

<h3>What is inflation?</h3>

A rise in the amount of a certain product or service is known as inflation.

Given data;

Cost of painting in the year 2021, P₁ = $560,000

Cost of painting in the year 2022, P₂ =?

The amount increases every year,x = $8,000

The cost of painting in the year 2022 is found as;

P₂ = P₁ + x

P₂= $560,000 + $8,000

P₂ = $ 568,000

Hence the price of a painting in the year 2022 will be $ 568,000.

To learn more about inflation refer;

brainly.com/question/19263433

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6 0
1 year ago
A company's profit C (in thousands of dollars) can be modeled by the polynomial function C = - 5x ^ 3 + 6x ^ 2 + 15x , where x i
steposvetlana [31]

Answer:

849 items.

Step-by-step explanation:

Given that the profit C (in thousands of dollars) for x thousands of items related as

C = - 5x ^ 3 + 6x ^ 2 + 15x \\\\\Rightarrow -5x^3+6x^2+15x -C=0\cdots(i)

As the profit is $14,000 for producing 2000 items, so

C= 14 thousand dollars and

x= 2 thousand items.

Putting C= 14 in the equation ( we have),

-5x^3+6x^2+15x -14=0\cdots(ii)

Now, x=2 is one of the solutions to the equation (ii), so (x-2) is a factor of the equation (ii), we have

(x-2)(-5x^2-4x+7)=0 \\\\\Rightarrow x-2=2 \; or \; -5x^2-4x+7=0

We have the given solution for x-2=0, so sloving -5x^2-4x+7=0 for other solutions.

-5x^2-4x+7=0 \\\\\Rightarrow x= \frac {-(-4)\pm \sqrt {(-4)^2-4\times (-5)7}}{2\times (-5)} \\\\\Rightarrow x= \frac {4\pm \sqrt {156}}{2\times (-5)} \\\\\Rightarrow x= \frac {4\pm 12.49}{2\times (-5)} \\\\\Rightarrow x = \frac {4+ 12.49}{2\times (-5)}, \frac {4- 12.49}{2\times (-5)} \\\\\Rightarrow x = -1.649, 0.849

As the number of items cant be negative, so x= 0.849 thousand is the other number of items.

Hence, the other number of items for the same profit is 849 items.

4 0
3 years ago
The volume of a spherical balloon is increasing at the rate of 25cm^3/min, how fast is the radius increasing when the radius is
S_A_V [24]

Answer:

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This is approximately 0.00497 cm/min that the radius is increasing.  

Step-by-step explanation:

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The volume and radius are both things that are changing with respect to time.

So their derivatives will definitely not be 0.

Let's differentiate:

V'=\frac{4}{3} \pi \cdot 3r^2r'

I had to use constant multiple rule and chain rule.

We are given V'=+25 \frac{\text{cm^3}}{\text{min}} and r=20 \text{cm}.

We want to find r'.

Let's plug in first:

25=\frac{4}{3}\pi \cdot 3(20)^2r'

25=\frac{4}{3} \pi \cdot 3(400)r'

25=\frac{4}{3} \pi \cdot 1200r'

Multiply both sides by 3:

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75=4800 \pi r'

Divide both sides by 4800 \pi:

\frac{75}{4800 \pi}=r'

\frac{1}{64 \pi}=r'

So the radius is increasing at \frac{1}{64\pi} \frac{\text{cm}}{\text{min}}.

This is approximately 0.00497 cm/min that the radius is increasing.  

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A school as 625 students and 325 of them are girls. what fraction of them are girls
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325/625 or 13/25 or 52% of the school.
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