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4 years ago

3x- 5y=7 5x- 2y=- 1X=? Y=?

Mathematics

1 answer:

Llana [10]4 years ago

3 0

Here is your answer in attachment

hope it help you

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9. A grocery store used to sell buik chocolate chip cookies for $0.65 for

777dan777 [17]

Answer:

$2.80

Step-by-step explanation:

.7 * 4= $2.80 for 400g

3 0

4 years ago

The random variable x represents the number of computers that families have along with the corresponding probabilities. Find the

Elena L [17]

Answer:

The correct option is (d).

Step-by-step explanation:

The complete question is:

The random variable x represents the number of computers that families have along with the corresponding probabilities. Use the probability distribution table below to find the mean and standard deviation for the random variable x.

x : 0 1 2 3 4

p (x) : 0.49 0.05 0.32 0.07 0.07

(a) The mean is 1.39 The standard deviation is 0.80

(b) The mean is 1.39 The standard deviation is 0.64

(c)The mean is 1.18 The standard deviation is 0.64

(d) The mean is 1.18 The standard deviation is 1.30

Solution:

The formula to compute the mean is:

$\text{Mean}=\sum x\cdot p(x)$

Compute the mean as follows:

$\text{Mean}=\sum x\cdot p(x)$

$=(0\times 0.49)+(1\times 0.05)+(2\times 0.32)+(3\times 0.07)+(4\times 0.07)\\\\=0+0.05+0.64+0.21+0.28\\\\=1.18$

The mean of the random variable x is 1.18.

The formula to compute variance is:

$\text{Variance}=E(X^{2})-[E(X)]^{2}$

Compute the value of E (X²) as follows:

$E(X^{2})=\sum x^{2}\cdot p(x)$

$=(0^{2}\times 0.49)+(1^{2}\times 0.05)+(2^{2}\times 0.32)+(3^{2}\times 0.07)+(4^{2}\times 0.07)\\\\=0+0.05+1.28+0.63+1.12\\\\=3.08$

Compute the variance as follows:

$\text{Variance}=E(X^{2})-[E(X)]^{2}$

$=3.08-(1.18)^{2}\\\\=1.6876$

Then the standard deviation is:

$\text{Standard deviation}=\sqrt{\text{Variance}}$

$=\sqrt{1.6876}\\\\=1.2990766\\\\\approx 1.30$

Thus, the mean and standard deviation for the random variable x are 1.18 and 1.30 respectively.

The correct option is (d).

3 0

3 years ago

About what point on parabola y=x^2 is 5 units away from the origin along the curve

konstantin123 [22]

the distance from the origin is 5, so

sqrt(x²+y²)=5

x²+y²=25

substitue y=x²

y+y²=25

y²+y-25=0

solve using calculator or the formula

to get

y =( -1+sqrt(1+4*25))/2

or y = (-1-sqrt(1+4*25))/2

the second solution is rejected because a square cannot be negative

the value of x is the positive or negative (sqrt... or -sqrt...) or y

4 0

4 years ago

Use the arc length formula and the given information to find r.

jek_recluse [69]

Answer:

Step-by-step explanation:

The thing with the arc length formula, s = rt, is that t is the angle in radians. Ours is in degrees, so we have to change it:

36 × $\frac{\pi }{180}=\frac{\pi }{5}$

So the formula we use to solve for r is:

$12=\frac{\pi }{5}r$

Multiply both sides by 5 over pi to get that

$r=\frac{60}{\pi } cm$

3 0

4 years ago

Which inequality is NOT true when x = -2?

jenyasd209 [6]

Answer:

Step-by-step explanation:

x > -2

x < -2

7 0

3 years ago