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horsena [70]
3 years ago
11

Doblando un alambre de 40 cm formamos un rectángulo. Hallar la expresión algebraica que define el área del rectángulo y calcula

su valor para x=4.
Mathematics
1 answer:
Lady bird [3.3K]3 years ago
5 0

Answer:

A = 128\,cm^{2}

Step-by-step explanation:

El área del rectángulo se halla a través de la siguiente fórmula: (The area of the rectangle is obtained by the following formula:)

A = (40\,cm - 2\cdot x)\cdot x

Donde el área y x se miden en centímetros cuadrados y centímetros, respectivamente. (Where area and x are measured in square centimeters and centimeters, respectively)

Ahora, x se reemplaza y se encuentra el valor numérico del área: (Now, x is substituted and numerical value of area is finally determined:)

A = [40\,cm - 2\cdot (4\,cm)]\cdot (4\,cm)

A = 128\,cm^{2}

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Forty five men can construct a road 210m long in 60 days. What length would be constructed by 72 men in 50 days assuming that al
blagie [28]

Answer:

280m

Step-by-step explanation:

Work rate would be (210m)/(45people)(60days)=7/90 m/(people)(day)

7/90 m/(people)(day) * 72people * 50days =280m

7 0
3 years ago
How do you convert 4.5 hours to minutes ?
marta [7]
Multiply the number of minutes in an hour(60) by 4.5
7 0
3 years ago
There are 100 balloons in total the ratio between the yellow and blue balloons is 8 to 12 how many are yellow
Virty [35]

If you have 8 yellow balloons for every 12 blue balloons, then if you have 20 balloons in total, 8 out of 20 of those balloons will be yellow. Then you can set up this ratio.

Then, you can use either cross multiplication or multiply the numerator and denominator by the same number to help solve for x. Personally, I prefer cross multiplication.

Finally, solve for x and if you had 100 balloons, you will have 40 yellow balloons.

4 0
4 years ago
Read 2 more answers
What is 11 1/2 + 10 11/16=
ahrayia [7]

Hey!



To solve this equation, we must first convert the mixed numbers into improper fractions. To do that we'll multiply the denominator by the whole number and add the total to the numerator.


<em>Original Equation :</em>

11\frac{1}{2} + 10\frac{11}{16} = ?


<em>New Equation {Converted Mixed Numbers Into Improper Fractions} :</em>

\frac{23}{2} + \frac{171}{16} = ?


Now that we've successfully changed our equation, we'll move onto the next step. Next we'll have change the fractions one more time so that the denominators are the same. To do that we'll multiply two by eight to get sixteen. We'll also be multiplying the top portion of the fraction by eight, because whatever you do to the bottom must also be done to the top; And vise versa.


<em>Fraction Conversion :</em>

\frac{23*8}{2*8} = \frac{184}{16}


So, now that we have our new fraction we can go ahead and plug that into our equation so we can start adding. Remember, we don't add the denominators, just the numerators.


<em>Old Equation :</em>

\frac{23}{2} + \frac{171}{16} = ?


<em>New Equation {Input New Fraction With Common Denominator} :</em>

\frac{184}{16} +\frac{171}{16} = ?


<em>Solution {New Equation Solved} :</em>

\frac{355}{16}


Now I'm not exactly sure how your instructor will accept your answer, but most prefer the final answer to be in the simplest form. In other words, they don't want it in the form of an improper fraction. They'd most likely rather have it as a mixed number.


<em>New Solution {Converted to a Mixed Number} :</em>

22\frac{3}{16}


Since the fraction cannot be simplified anymore, this should be our final answer.

<em>So, this means that the answer to the equation is </em> 22\frac{3}{16}.


Hope this helps!



- Lindsey Frazier ♥

5 0
3 years ago
Read 2 more answers
I don’t know what this is
svet-max [94.6K]

From the graph given

For f(x), where x = 3, on the graph f(3) is

f(3)=6

For g(x), where x = 3, on the graph g(3) is

g(3)=6

Hence,

f(3)=g(3)

The answer is the second option

3 0
1 year ago
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