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3 years ago

Just want you check if my answer is right...i'm not good in math.

1 answer:

7 0

X -> her money;
( 1 / 4 )*x = x / 4 for a pair of shoes;
( 1 / 5 )*x = x / 5 for a shoulder bag;
x - x / 4 -x / 5 = 20x / 20x - 5x / 20x - 4x / 20x = 11x / 20 the remainder;
11x / 20 - ( 3 / 8 )*x = 11x / 20 - 3x / 8 = 22x / 40 - 15x / 40 = 7x / 40 for her dress;
She pay 7 / 40 of her money for the dress.

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irina [24]

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8 0

3 years ago

Find the slope of each line. 2

ratelena [41]

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2 years ago

System of Equations Need help Trig

Yanka [14]

Looks like the system is

$\begin{cases}-2x+y+6z=1\\3x+2y+5z=16\\7x+3y-4z=11\end{cases}$

We can eliminate $y$ by taking

$(3x+2y+5z)-2(-2x+y+6z)=16-2(1)$

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$\implies x-z=2$

so that $z=x-2$ , and

$(7x+3y-4z)-3(-2x+y+6z)=11-3(1)$

$\implies7x+3y-4z+6x-3y-18z=11-3$

$\implies13x-22z=8$

Substitute $z=x-2$ into this last equation and solve for $x$ :

$13x-22(x-2)=8$

$\implies13x-22x+44=8$

$\implies-9x=-36$

$\implies x=4$

Then

$z=x-2$

$\implies z=4-2$

$\implies z=2$

Plug these values into any one of the original equation to solve for $y$ :

$-2x+y+6z=1$

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$\implies-8+y+12=1$

$\implies y=-3$

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6 0

3 years ago

Round 71.491 to the place of the underlined digit which is the 4

TiliK225 [7]

When rounding the 4 you look to the right of the number, which is the 4, and if the number is higher than 5 you would change the 4 to 5.
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5 0

2 years ago

80 x 25 = n Expanded form 80 x ( ) Partial product 80 x 20= 80 x 5 =

defon

9514 1404 393

Answer:

2000

Step-by-step explanation:

Expanded form:

80 × (20 + 5)

Partial products:

80 × 20 = 1600

80 × 5 = 400

Sum of partial products: 1600 + 400 = 2000.

8 0

2 years ago