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Murljashka [212]
3 years ago
5

Can u plz do this in expanded form 30,459,870

Mathematics
2 answers:
Eva8 [605]3 years ago
7 0

Answer:

30,000,000 + 400,000 + 50,000 + 9,000 + 800 + 70

Step-by-step explanation:

Not many steps, just typing it out.

30,000,000 + 400,000 + 50,000 + 9,000 + 800 + 70

(edit: thank you for Brainliest!)

givi [52]3 years ago
4 0

Answer:30,000,000 + 400,000 + 50,000, 9,000 + 800 + 70

(Not sure if this was the expanded form you were talking about, but I hope this helps).

Step-by-step explanation:

Add the numbers according to their place number and expand.

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Answer:

45

Step-by-step explanation:

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Decide wheather the Change is an increase or decrease and find the percent change original number =45 new number =18
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Answer:

40% decrease

Step-by-step explanation:

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3 years ago
Rationalize the denominator of sqrt -49 over (7 - 2i) - (4 + 9i)
zubka84 [21]
\sqrt{ \frac{-49}{(7-2i)-(4+9i) } } 


This one is quite the deal, but we can begin by distributing the negative on the denominator and getting rid of the parenthesis:

\frac{ \sqrt{-49}}{7-2i-4-9i}

See how the denominator now is more a simplification of like terms, with this I mean that you operate the numbers with an "i" together and the ones that do not have an "i" together as well. Namely, the 7 and the -4, the -2i with the -9i.
Therefore having the result: 

\frac{ \sqrt{-49} }{3-11i}

Now, the \sqrt{-49} must be respresented as an imaginary number, and using the multiplication of radicals, we can simplify it to \sqrt{49}  \sqrt{-1}
This means that we get the result 7i for the numerator.

\frac{7i}{3-11i}

In order to rationalize this fraction even further, we have to remember an identity from the previous algebra classes, namely: x^2 - y^2 =(x+y)(x-y)
The difference of squares allows us to remove the imaginary part of this fraction, leaving us with a real number, hopefully, on the denominator.

\frac{7i (3+11i)}{(3-11i)(3+11i)}

See, all I did there was multiply both numerator and denominator with (3+11i) so I could complete the difference of squares.
See how (3-11i)(3+11i)= 3^2 -(11i)^2 therefore, we can finally write:

\frac{7i(3+11i)}{3^2 - (11i)^2 }

I'll let you take it from here, all you have to do is simplify it further.
The simplification is quite straightforward, the numerator distributed the 7i. Namely the product 7i(3+11i) = 21i+77i^2.
You should know from your classes that i^2 = -1, thefore the numerator simplifies to -77+21i
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\frac{-77+21i}{130}
7 0
3 years ago
The equation of a straight line is y+10=5x
MariettaO [177]

Answer:

y=5x-10

Step-by-step explanation:

y+10=5x

y=5x-10

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y = number of cd's

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