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3 years ago

Madelyn earned $784 dollars

Mathematics

1 answer:

WINSTONCH [101]3 years ago

8 0

Answer:

56 hours

Step-by-step explanation:

Divide:

$784

-------------- = 56 hrs

($14/hr)

She babysat for 56 hours to earn that $784.

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What’s the soulution to A+4=14

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A= 10

subtract 4 from both sides to get “a” by itself.

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Draw Pascal's triangle with the number of rows required to expand the expression (2x^3+3y^2)^7

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1/2 (x−8)+1=2( 1 8 x−1)

nalin [4]

Answer:

The solution for the given algebraic equation is $\frac{ - 2}{71}$

Step-by-step explanation:

Given algebraic equation as :

$\frac{1}{2}$ ( x - 8 ) + 1 = 2 ( 18 x - 1 )

Now solving the equation while opening the brackets

So, $\frac{1}{2}$ × x - $\frac{1}{2}$ × 8 + 1 = 2 × 18 x - 2

Or, $\frac{x}{2}$ - $\frac{8}{2}$ + 1 = 36 x - 2

or, $\frac{x}{2}$ - 4 + 1 = 36 x - 2

or, $\frac{x}{2}$ - 3 = 36 x - 2

or, $\frac{x}{2}$ - 36 x = - 2 + 3

Or, $\frac{x}{2}$ - 36 x = 1

or, $\frac{x - 72 x}{2}$ = 1

or, $\frac{- 71 x}{2}$ = 1

∴ 71 x = - 2

I.e x = $\frac{ - 2}{71}$

Hence The solution for the given algebraic equation is $\frac{ - 2}{71}$ Answer

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3 years ago

How do i find the circumference of a circle

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In the system below, what is the sum of the x-coordinates of all solutions?

Ainat [17]

Answer:

The sum of the x-coordinates of all solutions is -2

Step-by-step explanation:

We are given system of equations as

$7x^2+3y^2=187$

$3y^2-7x=47$

Firstly, we will isolate x

$7x=3y^2-47$

$x=\frac{3y^2-47}{7}$

now, we can plug back in first equation

$7(\frac{3y^2-47}{7})^2+3y^2=187$

now, we can solve for y

$\frac{9y^4}{7}-\frac{261y^2}{7}+\frac{2209}{7}=187$

$\frac{9y^4}{7}-\frac{261y^2}{7}+\frac{2209}{7}-187=0$

$(y^2-25)(y^2-4)=0$

$y=-5,y=5,y=-2,y=2$

now, we can find x-values

At y=-5:

$x=\frac{3(-5)^2-47}{7}$

$x=4$

At y=5:

$x=\frac{3(5)^2-47}{7}$

$x=4$

At y=-2:

$x=\frac{3(-2)^2-47}{7}$

$x=-5$

At y=2:

$x=\frac{3(2)^2-47}{7}$

$x=-5$

now, we can add all x-coordinate solution values

$=4+4-5-5$

$=-2$

So,

the sum of the x-coordinates of all solutions is -2

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3 years ago