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2 years ago

I need help on this practice question

Mathematics

1 answer:

kodGreya [7K]2 years ago

3 0

-7x+-4y (I think- it depends on the topic)

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For each of the following, assume that the two samples are obtained from populations with the same mean, and calculate how much

Wittaler [7]

Answer:

d)6.00

d)3.00

Step-by-step explanation:

We are given that

n=4 scores

$S^2_1=68$

$S^2_2=76$

We have to find the difference should be expected, on average, between the two sample means.

$S_{M_1-M_2}=\sqrt{\frac{S^2_1}{n_1}+\frac{S^2_2}{n_2}}$

$n_1=n_2=4$

Using the formula

$S_{M_1-M_2}=\sqrt{\frac{68}{4}+\frac{76}{4}}$

$S_{M_1-M_2}=\sqrt{\frac{68+76}{4}}$

$S_{M_1-M_2}=\sqrt{36}=6$

Option d is correct.

Now, replace n by 16

$n_1=n_2=16$

$S_{M_1-M_2}=\sqrt{\frac{68}{16}+\frac{76}{16}}$

$S_{M_1-M_2}=\sqrt{\frac{68+76}{16}}$

$S_{M_1-M_2}=\sqrt{9}=3$

Option d is correct.

3 0

2 years ago

Find the x and y intercept of the line -10x-6y=120

Ipatiy [6.2K]

ANSWER

The x intercept is

$(-12,0).$

The y intercept is
$(0, - 20).$

EXPLANATION

The equation of the given line is

$- 10x - 6y = 120$

At x-intercept
$y = 0$

We substitute this y value to obtain the corresponding x value.

This implies that,

$- 10x - 6(0)= 120$

$- 10x - 0 = 120$

$- 10x = 120$

We divide both sides by -10 to get,

$x = - 12$
The x-intercept is

$(-12,0).$

At y-intercept also,
$x = 0$

We substitute this value of x into the equation to find the corresponding y-value.

This implies that,

$- 10(0) - 6y = 120$

$- 0- 6y = 120$

$- 6y = 120$

We divide through by -6 to get,

$y = - 20$

The y-intercept is
$(0,-20).$

7 0

2 years ago

Please give correct answer of all questions

pentagon [3]

Answer: 1) marks got by class 7 in PAT study

2) 22 and 25 respectively

3) three

4) Prachi

5) Steven

8 0

2 years ago

Which linear equation represents the graph?<br> A)y=3x+6<br> B)y=3x-3<br> C)y=-3x+6<br> D)y=-3x-6

romanna [79]

Answer:

D. y=-3x-6

Step-by-step explanation:

line slopes downwards by 3 and moves to the right by 1. this means the slope is -3. the line crosses the y axis at -6, so the equation for the line is -3x-6

3 0

2 years ago

Bella needs to paint a logo made using two right triangles. The dimensions of the logo are shown below. What is the area of the

Sergeu [11.5K]

Answer:

It would be 28.5. First, you would find the area of the smaller triangle by using the formula a=.5bh (area=.5xbasexheight) and then when you get that, you should get 6. Then, you do the same for the larger triangle and you should get 22.5. Then, 22.5 + 6 = 28.5, giving you that answer.

Step-by-step explanation:

8 0

2 years ago

I need help on this practice question ​

I need help on this practice question