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bonufazy [111]
3 years ago
15

A small art museum charges $5 for an adult ticket and $3 for a student

Mathematics
1 answer:
Shkiper50 [21]3 years ago
5 0

There were 37 student tickets and 52 adult tickets

Step-by-step explanation:

Let x be the number of student tickets and y be the adult tickets

Then

According to given statement that total 89 tickets were sold

x+y=89     Eqn 1

And

$5 for an adult ticket and $3 for student ticket ,and total cost $371

3x+5y=371    Eqn 2

From eqn 1

x=89-y

Putting in eqn 2

3(89-y)+5y=371\\267-3y+5y=371\\267+2y=371

Subtracting 267 from both sides

267+2y-267=371-267\\2y=104

Dividing both sides by 2

\frac{2y}{2}=\frac{104}{2}\\y=52

Putting y=52 in eqn 1

x+52=89\\x=89-52\\x=37

Hence,

There were 37 student tickets and 52 adult tickets

Keywords: Linear Equation, Variable

Learn more about linear equation at:

  • brainly.com/question/3071107
  • brainly.com/question/3126500

#LearnwithBrainly

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makvit [3.9K]

We use the formula : Displacement = Average Velocity * Time ;
17 = ( v + 8 ) * t ;
1 =  ( v - 8 ) * t ;
where v = the velocity of the boat; t is the time from expression " ... in the same amount of the time he rows ....."

Then 17 / 1 = (v + 8) / ( v - 8 ) ;
v + 8 = 17( v - 8 );
v + 8  = 17v - 136 ;
144 = 16v ;
v = 144 / 16;
v = 9 mph ;

18 = 9 * x ;
x = 18 / 9 ;
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The answer is 2 hours ;

4 0
3 years ago
Assume a test for a disease has a probability 0.05 of incorrectly identifying an individual as infected (False Positive), and a
Nana76 [90]

Answer:

0.00002 = 0.002% probability of actually having the disease

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

P(B|A) = \frac{P(A \cap B)}{P(A)}

In which

P(B|A) is the probability of event B happening, given that A happened.

P(A \cap B) is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Positive test

Event B: Having the disease

Probability of having a positive test:

0.05 of 1 - 0.000001(false positive)

0.99 of 0.000001 positive. So

P(A) = 0.05*(1 - 0.000001) + 0.99*0.000001 = 0.05000094

Probability of a positive test and having the disease:

0.99 of 0.000001. So

P(A \cap B) = 0.99*0.000001 = 9.9 \times 10^{-7}

What is the probability of actually having the disease

P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{9.9 \times 10^{-7}}{0.05000094} = 0.00002

0.00002 = 0.002% probability of actually having the disease

6 0
3 years ago
Solve the system of equations:<br> y= 2x - 5<br> y=x^2-5<br><br> Apex
arlik [135]

Answer:

A is the answer

Step-by-step explanation:

(0, -5):

-5 = 2(0) - 5 >>>   -5 = -5

-5 = (0)^2 - 5 >>>   -5 = -5

(2, -1):

-1 = 2(2) - 5 >>>   -1 = 4 - 5 >>>   -1 = -1

-1 = (2)^2 - 5 >>>   -1 = 4 - 5 >>>   -1 = -1

4 0
3 years ago
A natural food market sells organic granola in bulk for $1.60 per ounce. Which of the following statements is true?
Kobotan [32]
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3 years ago
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Find the diamter of a circle if its area is 706.9mm²​
Masteriza [31]

Answer:

<h2>30 mm</h2>

Step-by-step explanation:

The formula of an area of a circle:

A=\pi r^2

<em>r</em><em> - radius</em>

<em />

We have

A=706.9\ mm^2

Substitute:

\pi r^2=706.9          <em>divide both sides by π</em>

r^2=\dfrac{706.9}{\pi}        <em>use π ≈ 3.14</em>

r^2\approx\dfrac{706.9}{3.14}\\\\r^2\approx225\to r=\sqrt{225}\\\\r= 15\ mm

The diameter <em>d = 2r</em>.

Therefore

d=2(15)=30\ mm

3 0
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