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2 years ago

4/7 x ? = 16 Can someone please explain step by step to get marked as brainliest

Mathematics

2 answers:

Len [333]2 years ago

8 0

Answer:

Step-by-step explanation:

4 / 7 * x = 16

4 * x = 16 * 7

x = 4 * 7

x = 28

dimaraw [331]2 years ago

4 0

Answer:

the answer would be 28 becuase you would factor the numerator and denominator and cancel out the commen factors. i could explain more if needed :)

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What are the quadrants of the standard (x,y) coordinate plane below that contain points on the graph of the equation 4x - 2y = 8

miv72 [106K]

Answer: I III and IV

Step-by-step explanation:

The line intersects the x axis at (2,0) and the y axis at (0,-4) so the line goes through quadrants 1 3 and 4 so the answer is the middle or the 3rd from top

7 0

2 years ago

Please help ASAP....

sesenic [268]

Answer:

Step-by-step explanation:

All the other answers are changing direction at some point so the sign of velocity is changing. The only one that is not changing is C, so C is correct.

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3 years ago

An environmental engineer is tasked with determining whether a power plant cooling system is heating the water it uses more than

Tpy6a [65]

Answer:

The correct option is b

The correct option is h

Step-by-step explanation:

From the question we are told that

The sample size is n = 15

The difference in population proportion is $d = 6$

Generally the sample mean of the input temperature is

$\= x_1 = \frac{\sum x_i }{n}$

=> $\= x_1 = \frac{57.6 + 68.9 + \cdots +60.4 }{15}$

=> $\= x_1 = 62.57$

Generally the sample mean of the output temperature is

$\= x_2 = \frac{\sum x_i }{n}$

=> $\= x_2 = \frac{65.1 + 74.4 + \cdots +67.3 }{15}$

=> $\= x_2 = 55.97$

Generally the difference of the sample mean of the input temperature and that of the output temperature is

$\= d = \= x_1 - \= x_2$

=> $\= d = 62.57 -55.97$

=> $\= d = 6.6$

Generally the standard deviation is mathematically represented as

$s_d = \sqrt{\frac{\sum(d_1 - \= d )^2}{n} }$

=> $s_d = \sqrt{\frac{([57.6- 65.1]- 6.6)^2+ ([68.9 - 74.4]- 6.6)^2 + \cdots + ([60.4 - 67.3]- 6.6)^2 }{15} }$

=> $s_d = 1.732 [/texGenerally the test statistics is mathematically represented as [tex]t = \frac{ d - \= d }{ \frac{s_d}{\sqrt{n} } }$

=> $t = \frac{ 6-6.6 }{ \frac{1.732}{\sqrt{15} } }$

=> $t = 1.3417$

Generally the degree of freedom is mathematically represented as

$df = n - 1$

=> $df = 15 - 1$

=> $df = 14$

Generally the probability of t obtained from the t - distribution table at a degree of freedom of $df = 14$ is

$P(t >1.3417 ) = 0.10052569$

Generally the p-value is mathematically represented as

$p-value = 2 * P(t > 1.3417)$

=> $p-value = 2 * 0.10052569$

=> $p-value = 0.201$

From the values obtained we see that $p-value > \alpha$ hence

The decision rule is

Fail to reject the null hypothesis

The conclusion is

The cooling system changes the temperature of the water by 6 degrees.

8 0

3 years ago

Finish solving the system of equations –9.5x – 2.5y = –4.3 and 7x + 2.5y = 0.8 using the linear combination method.

trasher [3.6K]

Answer:

The value of x is 1.4 and y is -3.6

Step-by-step explanation:

The steps are :

$- 9.5x - 2.5y = - 4.3 - - - (1)$

$7x + 2.5y = 0.8 - - - (2)$

$(1) + (2)$

$- 9.5x + 7x - 2.5y + 2.5y = - 4.3 + 0.8$

$- 2.5x = - 3.5$

$x = \frac{7}{5} \: or \: 1.4$

$substitute \: x = 1.4 \: into \: (2)$

$7(1.4) + 2.5y = 0.8$

$9.8 + 2.5y = 0.8$

$2.5y = - 9$

$y = - \frac{18}{5} \: or \: - 3.6$

3 0

3 years ago

Please help!! I need this ASAP

olchik [2.2K]

Answer:

a= 2.5 times 42

Step-by-step explanation:

i had this class last year

8 0

2 years ago