2470.28277045 To 3 decimal places

Mathematics

2 answers:

SOVA2 [1]3 years ago

7 0

Answer:

2470.283

Step-by-step explanation:

2470.28277045 To 3 decimal place

After the decimal point, 2 is in tenths place

8 is in hundredths place

2 is in thousandths place

7 is in ten thousandths place

To round to 3 decimal place, we look at the number in ten thousandths place

7 is in ten thousandths place that is greater than 5, so we add 1 in thousandths place

So 2470.283 is rounded to 3 decimal places

jeka57 [31]3 years ago

3 0

To run the these figures to 3 decimal places

you need to count from the digit after the decimal point until you reach the 3rd number which is 2

so now the answer is 2470.283

This is because the decimal point lies between 2 and 7 and since 7 is great than 5 we add 1 to the 2 making it 3

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Solve x2 = 12x – 15 by completing the square. Which is the solution set of the equation? Solve x2 = 12x – 15 by completing the s

Svetlanka [38]

Answer: $6+\sqrt{21}\ \text{and}\ 6-\sqrt{21}$

Step-by-step explanation:

Given

Quadratic equation is

$x^2-12x+15=0$

Solving by completing the square method

$\Rightarrow x^2-2\cdot 6\cdot x+15=0\\\text{add and subtract 36}\\\Rightarrow x^2-2\cdot 6\cdot x+15+36-36=0\\\Rightarrow x^2-2\cdot 6\cdot x+36+(-36+15)=0\\\text{using}\ (a-b)^2=a^2+b^2-2ab\\\Rightarrow (x-6)^2-21=0\\\Rightarrow (x-6)^2=21\\\Rightarrow x-6=\pm \sqrt{21}\\\Rightarrow x=6\pm \sqrt{21}$