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1 year ago

2x – 4y + 3 = 9 5y = 3x – 8

Mathematics

2 answers:

sertanlavr [38]1 year ago

4 0

Step-by-step explanation:

2(5) - 4(1) +3 =9

10 - 4 +3 = 9

Margarita [4]1 year ago

4 0

Answer:

are you trying to find the value for x and y?

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The grid model expressed as a ratio of shaded squares to total squares is _____

fredd [130]

Answer:

1 = 25/50

2 = 1/2

3 = 0.50

4 = 50%

Step-by-step explanation:

i got it right on edg and i hope it helps :)

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3 years ago

Simplify. Rewrite the expression in the form 4^n. 4^11/4^-8

Tasya [4]

Answer:

S6tep-by-step explanation:

4^(11+8) = 4^19 is the solution

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2 years ago

Una empresa comercial vende automóviles cuyo precio es de S/. 60 000, con una cuota inicial del 20%, para cancelar el saldo en 3

Inessa05 [86]

Responder:

2560

Explicación paso a paso:

Dado lo siguiente:

Precio del automóvil = 60000

Cuota inicial = 20% del precio = (0.2 * 60000 = 12,000

Saldo = (60000 - 12000) = 48000

La empresa cobra un interés simple del 12% cada 6 meses

Periodo de pago = 30 meses / 6 = 5 periodos

Interés simple: p * r * t

= 48000 * 0,12 * 5 = 28800

Por lo tanto, monto total a reembolsar, incluidos los intereses:

Balance + 28800; 48000 + 28800 = 76800

El reembolso mensual es fijo;

Por lo tanto,

76800/30 = 2560

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3 years ago

You earn $9.20 per hour at your

Mkey [24]

Answer:

32.5

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2 years ago

Read 2 more answers

Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for V

ryzh [129]

Answer:

∑x=109, ∑x²=4173, ∑y=87, ∑y²=2083.

sample mean for x=10.9.

variance for x=331.66.

standard deviation for x=18.21.

sample mean for y=8.7.

variance for y=147.34.

standard deviation for y=12.14.

75% Chebyshev interval around the mean for x values

-25.52,47.32

75% Chebyshev interval around the mean for y values

-15.58,32.98

The interval shows that Vanguard Balanced index has smaller spread.

coefficient of variation for x=167.06%

coefficient of variation for y=139.54%

Smaller CV means lower risk so, smaller CV is better.

Step-by-step explanation:

Note: ALL ANSWERS ARE ROUNDED TO TWO DECIMAL PLACES

∑x=17+0+17+28+28+27+29−12−12−13=109,

∑x²=17²+0²+17²+28²+28²+27²+29²+(−12)²+(−12)²+(−13)²=4173,

∑y=14−2+27+18+20+11+14−2−3−10=87,

∑y²=14²+(−2)²+(27)²+(18)²+(20)²+(11)²+(14)²(−2)²+(−3)²+(−10)²=2083.

sample mean for x=∑x/n=109/10=10.9.

$variance x=\frac{sum(x-mean )^2}{n-1}$

x-mean

6.10

-10.90

6.10

17.10

16.10

18.10

-22.90

-23.90

sum(x-mean)²=6.10 ²+(-10.90 )²+6.10 ²+17.10² +17.10²+ 16.10² +18.10² +(-22.90 )²+(-22.90 )²+(-23.90 )²=2984.9

$variance x=\frac{2984.9}{9}$

Variance for x=331.66.

standard deviation for x=√variance for x

standard deviation for x=√331.66

standard deviation for x=18.21.

sample mean for y=∑y/n=87/10=8.7.

$variance y=\frac{sum(y-mean )^2}{n-1}$

y-mean

5.30

-10.70

18.30

9.30

11.30

2.30

5.30

-10.70

-11.70

-18.70

sum(y-mean)²=5.30 ²+(-10.70 )²+18.30² +9.30² +11.30² +2.30² +5.30² +(-10.70 )²+(-11.70 )²+(-18.70 )²=1326.1

$variance y=\frac{1326.1}{9}$

variance for y=147.34.

standard deviation for y=√variance for y

standard deviation for y=√147.34

standard deviation for y=12.14.

75% Chebyshev Interval

mean±k standard deviation

We have to find value of k.

$1-\frac{1}{k^{2} } =0.75$

$1-0.75 =\frac{1}{k^{2} }$

$\frac{1}{k^{2} }=0.25$

k²=4

k=2

so, 75% Chebyshev Interval for x

10.9±2*(18.21)

[-25.52,47.32]

75% Chebyshev Interval for y

8.7±2*(12.14)

[-15.58,32.98]

The interval shows that Vanguard Balanced index has smaller spread.

$CV for x=\frac{S.Dx}{meanx} *100$

$CV for x=\frac{18.21}{10.9} *100$

CV for x=167.06%

CV for y

$CV for y=\frac{S.Dy}{meany} *100$

$CV for y=\frac{12.14}{8.7} *100$

Cv for y=139.54%

The smaller CV shows the smaller amount of risk so, smaller CV is better.

4 0

3 years ago