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Rus_ich [418]
3 years ago
9

Five hundred draws are made at random with replacement from a box of numbered tickets; 276 are positive. Someone tells you that

50% of the tickets in the box show positive numbers. Do you believe it
Mathematics
1 answer:
Anna71 [15]3 years ago
6 0

Answer: No

Step-by-step explanation:

Based on the information given in the question, I don't believe that 50% of the tickets in the box show positive numbers.

Since 500 draws are made and 276 are positive, the percentage of the tickets that'll show positive numbers will be:

= 276/500 × 100

= 55.2%

Therefore, about 55.2% of the tickets are positive. The statement that 50% are positive is incorrect.

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wolverine [178]

Answer:B

Step-by-step explanatioslope intercept is y=mx+b and choice B is NOT in that form so your answer would be B

8 0
3 years ago
the area of a rectangular window is 6216 cm^2. if the length of the window is 84 cm, what is it's width?​
Rus_ich [418]

Answer:

<h3>The answer is 74 cm</h3>

Step-by-step explanation:

The area of a rectangle = length × width

Since we are finding the width

We have

width  = \frac{area}{length}  \\

From the question

area = 6216 cm²

length = 84 cm

The width is

width =  \frac{6216}{84}  \\

We have the final answer as

<h3>74 cm</h3>

Hope this helps you

3 0
4 years ago
Help pls I will get a hit if I don’t
White raven [17]

Answer:

d.  87.92

Step-by-step explanation:

3.14*2*14=87.92

i know its right im positive

8 0
3 years ago
Read 2 more answers
I need help you don't have to explain the answer I just need it, thank you!
denpristay [2]

Answer:

j = 10

Step-by-step explanation:

You add 7 to both sides then divide both sides by -2

6 0
3 years ago
Two boats depart from a port located at (–8, 1) in a coordinate system measured in kilometers and travel in a positive x-directi
miss Akunina [59]

Answer:

\left\{\begin{array}{l}y=-\dfrac{1}{9}x^2 +\dfrac{2}{9}x+\dfrac{89}{9}\\ \\y=\dfrac{1}{8}x^2 -7\end{array}\right.

Step-by-step explanation:

1st boat:

Parabola equation:

y=ax^2 +bx+c

The x-coordinate of the vertex:

x_v=-\dfrac{b}{2a}\Rightarrow -\dfrac{b}{2a}=1\\ \\b=-2a

Equation:

y=ax^2 -2ax+c

The y-coordinate of the vertex:

y_v=a\cdot 1^2-2a\cdot 1+c\Rightarrow a-2a+c=10\\ \\c-a=10

Parabola passes through the point (-8,1), so

1=a\cdot (-8)^2-2a\cdot (-8)+c\\ \\80a+c=1

Solve:

c=10+a\\ \\80a+10+a=1\\ \\81a=-9\\ \\a=-\dfrac{1}{9}\\ \\b=-2a=\dfrac{2}{9}\\ \\c=10-\dfrac{1}{9}=\dfrac{89}{9}

Parabola equation:

y=-\dfrac{1}{9}x^2 +\dfrac{2}{9}x+\dfrac{89}{9}

2nd boat:

Parabola equation:

y=ax^2 +bx+c

The x-coordinate of the vertex:

x_v=-\dfrac{b}{2a}\Rightarrow -\dfrac{b}{2a}=0\\ \\b=0

Equation:

y=ax^2+c

The y-coordinate of the vertex:

y_v=a\cdot 0^2+c\Rightarrow c=-7

Parabola passes through the point (-8,1), so

1=a\cdot (-8)^2-7\\ \\64a-7=1

Solve:

a=-\dfrac{1}{8}\\ \\b=0\\ \\c=-7

Parabola equation:

y=\dfrac{1}{8}x^2 -7

System of two equations:

\left\{\begin{array}{l}y=-\dfrac{1}{9}x^2 +\dfrac{2}{9}x+\dfrac{89}{9}\\ \\y=\dfrac{1}{8}x^2 -7\end{array}\right.

7 0
4 years ago
Read 2 more answers
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