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Julli [10]
3 years ago
9

The line graph shows the number of space shuttle launches by the United States from 1981 through 1986.

Mathematics
1 answer:
Nitella [24]3 years ago
4 0

<u>Answer:</u>

  • The number of space shuttle launches the greatest in the year <u>1</u><u>9</u><u>8</u><u>5</u> (C)

<u>Step-by-step</u><u> Explanation</u><u>:</u>

According to the graph given in the attachment, the no. of launches made in those years are:

  • 1981: 2
  • 1982: 3
  • 1983: 4
  • 1984: 5
  • 1985: 9
  • 1986: 6

The no. of launches was greatest in the year <u>1</u><u>9</u><u>8</u><u>5</u> and the line graph touches the highest peak in 1985.

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Answer:

1. leave the radical symbol and don't try to convert it to a decimal form

2. The approximated value differs from the exact solution and doesn't give a true equation.

3. Depending on the case, if she needs a mathematical answer, the exact value should be used, but for more practical applications, the rounded decimal form would be more usable.

Step-by-step explanation:

The step by step solution to the equation:

4x^3=756\\x^3=\frac{756}{4} =189\\x=\sqrt[3]{189} \\x=\sqrt[3]{3^3*7} \\x=3*\sqrt[3]{7}

1.- Exact solution means that if in the final step when solving for x the value of  x^3 is not a perfect cube, one needs to leave it indicated as a radical expression (with the radical symbol).

in our case, the cubic root of 189 is not a perfect cube. The factor form of 189 is: 3^3*7, so there is a perfect cube factor (3^3), but the other factor (7) is a prime number. Therefore 3 can get out of the root, while 7 stays inside.

2.- The equation was solved above, in exact form. Now to solve it giving a decimal approximation, we use a calculator to find the cubic root of 7, which is an irrational number with infinite number of decimals, the first of which we type here: \sqrt[3]{7} = 1.91293118...

Therefore, the decimal approximation to the solving for x would be:

x=3*\sqrt[3]{7}=3*1,91293118...=5.73879...=5.74

Where we rounded to two decimals as requested.

When we replace the exact answer in the original expression, we get a perfect equality:

4*x^3=756\\4* (3\sqrt[3]{7} )^3=756\\4*3^3*(\sqrt[3]{7} )^3=756\\4*27*7=756\\\\756=756

While if we use the approximate answer, we get:

4*x^3=756\\\\4*(5.74)^3=756\\\\4*189.119224=756\\756.476896=756

which is NOT a true equality.

3.- I would stick with the idea of showing the exact answer as answer to the mathematical equation. but for a practical case (for example she needs to by some material as a result of her equation solving, it would be more practical to take the numerical approximation to the store, instead of a cubic root of a number.

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Answer:

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Step-by-step explanation:

De la pregunta anterior:

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Cruz multiplicar

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