2 years ago

Geometry help #29 please help

Mathematics

1 answer:

vekshin12 years ago

4 0

8x+12x=90
20x=90
x=90/20
x=4.5

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Elena L [17]

Answer:

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Step-by-step explanation:

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Write the expression in factored form. 81m^2-49

ivolga24 [154]

We can use the difference of two squares, which is:

x^2 + y^2 = (x-y)(x+y)

So,

(9m-7)(9m+7)

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2 years ago

What is two other ways to write 8.517

vova2212 [387]

One way is in word form the other way is in fraction form example

1. eight and five-hundred seventeen thousandths
2. 8517/1000

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2 years ago

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Snowcat [4.5K]

Greetings!

Substitute:
$x+y=1000 \\ x=1000-y$
Now we can input this into the other equation so, we only have one variable.

Solve for y.
$0.05(1000-y)+0.06y=57$
Distribute the parenthesis.
$50-0.05y+0.06y=57$
Combine Like Terms.
$50-0.01y=57$
Add -50 to both sides.
$(50-0.01y)+(-50)=(57)+(-50)$
Simplify.
$0.01y=7$
Divide both sides by 0.01.
$(0.01y)/0.01=(7)/0.01$
Simplify.
$y=700$

Input this value into the other equation.
$x+700=1000$
Add -700 to both sides.
$(x+700)+(-700)=(1000)+(-700)$
Simplify.
$x=300$

The answer would be 300,700

Hope this helps.
-Benjamin

8 0

3 years ago