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brilliants [131]
3 years ago
12

The experimental probability of rain in a certain town is 20 percent. In the next 45 days, how many days can one expect it to ra

in?
Mathematics
1 answer:
wlad13 [49]3 years ago
4 0

Answer:

9 days

Step-by-step explanation:

Experimental probability is the number of times an event occurs divided by the total number of trials of the event.

We know the experimental probability, based on past data, that rain will fall 20% chance.

So, one can expect, that in the next 45 days, rain will fall 20% of the days, according to our experimental probability.

First, we find decimal equivalent of 20%. We divide by 100:

20% = 20/100 = 0.2

Now we multiply this with the number of days:

0.2 * 45 = 9

Thus,

One can expect it to rain 9 days

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Slope= -1

Step-by-step explanation:

Rise over run

2 to the right 2 down = 2/-2

Simplify to -1

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3 years ago
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Solve by factorising x2+8x+15=0
Alex_Xolod [135]

Answer:

Hi! The correct answer is x= -3 ,-5!

Step-by-step explanation:

<em>~Factor and set each factor equal to 0~</em>

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3 years ago
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Can someone help me with this first one to answer gets brainllest and 20 points.
Afina-wow [57]

Answer:

Sorry i don't get this at all. what grade is this ?!!?!?!?

Step-by-step explanation:

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3 years ago
A rectangular swimming pool is 15 meters long, 13 1 2 meters wide, and 1 1 2 meters deep. What is its volume?
Helga [31]

Answer: 1439

Step-by-step explanation:

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3 years ago
What are the roots of this equation? x2-4x+9=0
zysi [14]

Considering the definition of zeros of a function, the zeros of the quadratic function f(x) = x² + 4x +9 do not exist.

<h3>Zeros of a function</h3>

The points where a polynomial function crosses the axis of the independent term (x) represent the so-called zeros of the function.

In summary, the roots or zeros of the quadratic function are those values ​​of x for which the expression is equal to 0. Graphically, the roots correspond to the abscissa of the points where the parabola intersects the x-axis.

In a quadratic function that has the form:

f(x)= ax² + bx + c

the zeros or roots are calculated by:

x1,x2=\frac{-b+-\sqrt{b^{2}-4ac } }{2a}

<h3>This case</h3>

The quadratic function is f(x) = x² + 4x +9

Being:

  • a= 1
  • b= 4
  • c= 9

the zeros or roots are calculated as:

x1=\frac{-4+\sqrt{4^{2}-4x1x9 } }{2x1}

x1=\frac{-4+\sqrt{16-36 } }{2x1}

x1=\frac{-4+\sqrt{-20 } }{2x1}

and

x2=\frac{-4-\sqrt{4^{2}-4x1x9 } }{2x1}

x2=\frac{-4-\sqrt{16-36 } }{2x1}

x2=\frac{-4-\sqrt{-20} }{2x1}

If the content of the root is negative, the root will have no solution within the set of real numbers. Then \sqrt{-20} has no solution.

Finally, the zeros of the quadratic function f(x) = x² + 4x +9 do not exist.

Learn more about the zeros of a quadratic function:

brainly.com/question/842305

brainly.com/question/14477557

#SPJ1

6 0
1 year ago
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