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Scientific notation always has one nonzero digit before the decimal point. Therefore, the correct scientific notation for this number would be:

3.9 * 10^8

*You move the decimal point one place to the right, and take out one power of 10.

Use the Pythagorean Theorem for this problem:

$${{\mathtt{a}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{b}}}^{{\mathtt{2}}} = {{\mathtt{c}}}^{{\mathtt{2}}}$$

In other words: one side of the rectangle squared plus the other side squared equals the diagonal squared.

Therefore:

$${{\mathtt{12}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{17}}}^{{\mathtt{2}}} = {{\mathtt{c}}}^{{\mathtt{2}}}$$

$${\mathtt{144}}{\mathtt{\,\small\textbf+\,}}{\mathtt{289}} = {{\mathtt{c}}}^{{\mathtt{2}}}$$

$${\mathtt{433}} = {{\mathtt{c}}}^{{\mathtt{2}}}$$

Now take the square root of both sides:

c = $${\sqrt{{\mathtt{433}}}} = {\mathtt{20.808\: \!652\: \!046\: \!684\: \!811\: \!6}}$$

I have not made sense of you question yet but have you tried drawing a picture?

That is the first thing I would do!

Use the site calculator for this. Type in 0.025 * 872.09.

= $${\mathtt{0.025}}{\mathtt{\,\times\,}}{\mathtt{872.09}} = {\mathtt{21.802\: \!25}}$$

26,250,000 

point, plane and line

Concerned with the supply of goods and other businesses that sell to consumers. 

or in math 

multiply a single term and two or more terms inside a set of partentheses. 

1/4 is the correct answer

"what number" can be expressed as x, because we don't know what it is.

your question doesn't make sense.

$$\\82<8-7x\\
74<-7x\\
-7x>74\qquad \mbox{When you swap sides you have to turn the sign around}\\
x<74/-7 \qquad \mbox{When you mult or divide by a neg you swap the sign around}$$

You cannot divide by 0.  It is undefined.

5.4(3k-12)+3.2(2k-6)=-136

(5.4 x 3k) + (5.4 x -12) + (3.2 x 2k) + (3.2 x -6) = -136

16.2k + (-64.8) + 6.4k + (-19.2) = -136

16.2k + (-64.8) + 6.4k + (-19.2) = -136

22.6k + (-64.8) + (-19.2) 

22.6k + -84 = -136

            +84    +84

----------------------------

22.6k = -52

k ≈ 2.3

6x+3=4x+11                      ---Subtract 4x from both sides to "clear" 4x from the right side

-4x     -4x

--------------------

2x + 3 = 0 + 11

2x + 3 = 11                           ---Subtract 3 from both sides to "clear" 3 from the left side

     - 3      -3

---------------------

2x = 8                               ---Finally, divide both sides by 2

2 ÷ 2x = 8 ÷ 2

2 ÷ 2x = 4

x = 4

4 goes into -12 and 4.

Also, 2 goes into -12 and 4

Thank you very much.

it means x will be whatever makes that equation bigger than 82.   example:   x= -12  

To convert a Decimal to a Fraction follow these steps:

100*10=1000