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2 years ago

Can somebody tell me the answer to this please

Mathematics

2 answers:

AlexFokin [52]2 years ago

8 0

Answer: D

Step-by-step explanation: We first need to solve the inequality.

First subtract 10 from both sides to get -x < -8.

Now divide both sides by -1, but watch out.

If you multiply or divide both sides of an inequality by

a negative number, you must switch the direction of the inequality sign.

So we have x > 8.

Start with an open dot at 8 and draw and arrow to the right.

We use an option dot since x is greater than but not equal to 8.

So option D is your answer.

Fudgin [204]2 years ago

8 0

Answer:

The correct answer is D

Step-by-step explanation:

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Okay I need help por fvaor

Rasek [7]

Answer:

523.6 (this answer is estimated)

Step-by-step explanation:

4/3*5^3*pi

8 0

2 years ago

Read 2 more answers

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

A kilometre is about 5/8 mile. How many kilometres are in 2 3/4 miles?

Lapatulllka [165]

Answer:

To do this in my head: 60km = 40km+20km

So 40km/8km = 5

40 k is approximately 5x5miles = 25 miles

20k is half that or 12.5 miles

60 is about 25+12.5 miles

or 37.5 miles

4 0

2 years ago

If you cross multiply 10 over 2.4=15 over x

likoan [24]

IO/2.4 = I5/x
IOx = 36
x = 3.6

8 0

2 years ago

A contractor is building brick walls. He arranges the bricks he needs into 6 equal piles. Altogether the bricks weigh 41,790 pou

horrorfan [7]

The answer to your question is 6,965 pounds

41,790/6= 6,965

6 0

3 years ago