All categories

4 years ago

Help pls ASAP Thanks

Mathematics

1 answer:

dezoksy [38]4 years ago

8 0

Answer:

y = 3

y = 5

(last answer choice)

Step-by-step explanation:

A system of equation is given in "x" and "y".

For it to have a solution, there should be a value for x and a value for "y".

There needs to be 2 values, one for x and another for y.

It doesn't matter if the values of x and y are same, but there needs to be one value of x and one value of y (if linear equations).

First one has a value of x = 5 and y = 3, so there are 2 values, one for x and another for y, distinct values. So it's okay.

The second one has 2 values for x and y, respectively. THey are same, doesn't matter. So, this one is okay as well.

The last one has NO VALUE for x and has 2 values for y. So, this one doesn't have a proper solution.

So, the last one of the choices shown has NO SOLUTION.

You might be interested in

fred ha 227 dollars to spend on 6 books after buying them he had 17 dollars how much did each book cost

NemiM [27]

Answer:

$35

Step-by-step explanation:

If Fred has 227 total and ends up with 17, do 227-17 to determine how much he spent. ($210). If he bought 6 books, then divide $210 by 6.

Hence, each book was $35

7 0

3 years ago

Which scientist performed the cathode ray experiment leading to the discovery of electrons?

kolbaska11 [484]

Answer:

J.J.Thomson was the scientist who discovered electrons. He discovered the electrons from the cathode ray experiment

Step-by-step explanation:

8 0

3 years ago

Find the perimeter of the rectangle with a A. 11 in. B. 22 in. C. 28 in. D. 56 in.

Gnesinka [82]

Answer:

B.22

Step-by-step explanation:

4+4+7+7=22

4 0

3 years ago

Read 2 more answers

A gift shop uses two sizes of boxes for presents. These boxes have exactly the same shape. The smaller box is 24 cm long, and th

Vesnalui [34]

Answer:

1,092 cm²

Step-by-step explanation:

Smaller box:

Length = 24 cm

Wrapping paper = 936 cm²

Bigger box:

Length= 28 cm

Wrapping paper = x cm²

Box : wrapping paper = 24 cm : 936 cm²

Box : wrapping paper = 28 cm : x cm²

Equate both ratios to find x

24 : 936 = 28 : x

24/936 = 28/x

Cross product

24 * x = 936 * 28

24x = 26,208

x = 26,208 / 24

x = 1,092 cm²

Bigger box:

Length= 28 cm

Wrapping paper = 1,092 cm²

7 0

3 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