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yarga [219]
3 years ago
9

I need the answer and a explanation. simplify

D%20%7D" id="TexFormula1" title="\frac{\sqrt{18} }{\sqrt{81} }" alt="\frac{\sqrt{18} }{\sqrt{81} }" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
Alex Ar [27]3 years ago
7 0
I put the radical around the whole thing and then simplified the fraction

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How do I solve this equation
Anestetic [448]
-x - y = 8
2x - y = -1

Ok, we are going to solve this in 2 parts.  First we have to solve for one of the variables in one of the equation in terms of the other variable.  I like to take the easiest equation first and try to avoid fractions, so let's use the first equation and solve for x.

-x - y = 8      add y to each side
-x = 8 + y      divide by -1
x = -8 - y

So now we have a value for x in terms of y that we can use to substitute into the other equation.  In the other equation we are going to put -8 - y in place of the x.

2x - y = -1
2(-8 - y) - y = -1      multiply the 2 through the parentheses
-16 - 2y - y = -1      combine like terms
-16 - 3y = -1            add 16 to both sides
-3y = 15                   divide each side by -3
y = -5

Now we have a value for y.  We need to plug it into either of the original equations then solve for x.  I usually choose the most simple equation.

-x - y = 8
-x - (-5) = 8            multiply -1 through the parentheses
-x + 5 = 8                subtract 5 from each side
-x = 3                      divide each side by -1
x = -3

So our solution set is

(-3, -5)

That is the point on the grid where the 2 equations are equal, so that is the place where they intersect.

4 0
3 years ago
What is 204,902 is scientific notation? also 124,510 in scientific notation.
Nesterboy [21]
204 902.0

124 510.0

Move the decimal point to the left, until you have a number less than 10.

204 902 = 2.04902 × 10⁵

124 510 = 1.2451  × 10⁵
3 0
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She should chose the $9 because it is cheaper ;)
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2 years ago
Evaluate the expression below for x = 4 6 (x +7)
Drupady [299]

Answer:

D. 66

Step-by-step explanation:

6×(4+7)

6×11

=66

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What am I doing with my life?
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Lol hey what do you wanna do whatever you wanna do just follow your dreams and I’m bored to
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3 years ago
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