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Dennis_Churaev [7]
3 years ago
7

Lily bought 6 skirts and 5 coats for a total of $452.62. If Lily's

Mathematics
1 answer:
PSYCHO15rus [73]3 years ago
5 0

Let x = cost of one skirt

Let y = cost of one coat.

We need to construct a system of equations to help us solve this problem.

Lily: $452.62 = 6x + 5y

Sis: $289.36 = 3x + 5y.

Let's solve this by elimination. Multiply the second equation by -1

Lily: $452.62 = 6x + 5y

Sis: -$289.36 = -3x + -5y. Add the equations together.

$163.26 = 3x. Divide each side by 3.

$54.42 = x. Plug this into one of our original equations.

$452.62 = 6(54.42) + 5y. Multiply 6 by 54.42

$452.62 = 326.52 + 5y. Subtract 326.52 from each side.

$126.1 = 5y. Divide each side by 5

$25.22 = y.

One coat costs $25.22

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12a^2*b^4-36a^2*b+44abc
spayn [35]

Let's simplify step-by-step.

12a^2*b^4-36a^2*b+44abc=

There are no like terms.

Answer:

12a^2*b^4-36a^2*b+44abc=

5 0
3 years ago
(secx)dy/dx=e^(y+sinx), please help me solve the differential equation. Thanks :)
nalin [4]
First, you must know these formula  d(e^f(x) = f'(x)e^x dx, e^a+b=e^a.e^b, and d(sinx) = cosxdx, secx = 1/ cosx

(secx)dy/dx=e^(y+sinx), implies  <span>dy/dx=cosx .e^(y+sinx), and then 
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integdy=integ(cosx .e^y.e^sinx)dx, integdy=e^y.integ.(cosx e^sinx)dx, but we know that   d(e^sinx) =cosx e^sinx dx,
so integ.d(e^sinx) =integ.cosx e^sinx dx,
and e^sinx + C=integ.cosx e^sinxdx
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7 0
3 years ago
Read 2 more answers
On the first
liubo4ka [24]

Answer:

0.93

Step-by-step explanation:

u have to add them all and divide by 12. then u add all of them but the outlier and divide by 11. then u subtract.

4 0
3 years ago
Which of these numbers is irrational?<br> a)2.3<br> b)sqrt 3<br> c)sqrt 4<br> d)1/3
AveGali [126]
B it is a surd and surds are irrational
8 0
4 years ago
Read 2 more answers
William deposited $7500 into an account that accumulated simple interest at a rate of 2.5% a year. At this rate, how long would
egoroff_w [7]

Answer:

15 years

Step-by-step explanation:

$10,312.50-$7500 = $2,812.50 in interest we need over time

7500 x 2.5= $187.50/year (interest)

$2,812.50 / $187.50 = 15 years

4 0
3 years ago
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