How do you write 3.806 million in standard form ?

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Answer 1
Answer: 3,806,000 is the correct answer.

There are three in the millions place and 806 in the thousands. There are no numbers in the hundreds so you place zeros.

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Solve the system of equations x - 2y = 2 and 3x - 5y = 9 by writing and solving a matrix equation. Show all your work.
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Solve the system:
2x-5y=7
3x-2y=-17

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\begin{cases}2x-5y=7 \ \ /*3 \n 3x-2y=-17\ \ / *(-2) \end{cases}\n \n\begin{cases}6x-15y=21 \n -6x+4y= 34 \end{cases}\n+ \ ------- \n-11y=55 \ \ / :(-11)\n \ny=-(55)/(11)

y=-5 \n \n 2x-5y=7\n \n2x-5*(-5)=7\n \n2x+25=7\n \n2x=7-25

2x=-18\ \ /:2 \n \n x=-(18)/(2) \n \nx=-9 \n \n\begin{cases} x=-9 \n y=-5 \end{cases}


How to simplify the expression -(-19)?

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-(-9) = 9 because the minus outside switches all the operations that are inside the parentheses. 

ABCD is a rectangle with angle abd=40 determine angle dbc

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I can’t do this without an image, because I am not that smart. All angles should be 90, but a rectangle equals 360 in a rectangle.

Can anyone help me find the answer to

2x+9x+4

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so to factor

to factor this in ax^2+bx+c form where a is greater than 1,
b=z+y
ac=xy
solve

so a=2
b=9
c=4

9=y+z
c times a=4 times 2=8
what 2 numbers add up to 9 and mulitply to get 8?
factor 8
8=
1 times8
2 times 4
if we add them up we get
1+8=9 check
2+4=6

the numbers are 1 and 8
split up the middle term
2x^2+1x+8x+4
group
(2x^2+1x)+(8x+4)
factor out/reverse distribute
(x)(2x+1)+(4)(2x+1)
reverse distribute useing distributive proerty
ab+ac=a(b+c)
(x+4)(2x+1)

the factored form is (x+4)(2x+1)

Solve the equation. x/2 + 2x/3 =5

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x=30/70                                                  it is simple if you think about it 

Does anyone know about this one? I appreciate you guys helping me((:

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For your question the answer is B.

                                              Hope this helps:)
 your answer is b  hope i helpedd