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3 years ago

PLEASE SOMEONE HELP ME

Mathematics

1 answer:

borishaifa [10]3 years ago

7 0

Answer:

use a perimeter calculator if you want to for me using a calcultor is pretty uch illegal in my head and it diesnt help e on bit and use one only if you need to thus I wouldn'tknow your answer and I can't use a calculator as I don't really need it sorry.

Step-by-step explanation:

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I lied-<br> (21.2) x (0.02)<br><br> (2.05) x (0.004)

Llana [10]

Answer:

oof

21.2 x 0.02 = 0.424

2.05 x 0.004 = 0.0082

Step-by-step explanation:

8 0

2 years ago

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Determine whether the equation has no solution, one solution, or infinitely many solutions. 7(12 – 2 x ) = 4(3 – 3 x )

Alex777 [14]

Answer: The equation has one solution

Step-by-step explanation: First , open the brackets

7( 12 - 2x ) = 4 (3 - 3x )

84 - 14x = 12 - 12x

collect the like terms

84 - 12 = - 12x + 14x

72 = 2x

Therefore divide through by 2

x = 72/2

x = 36

Therefore, the equation has only one solution

3 0

3 years ago

johnny wants to construct a circular area for his patio. he bought enough stones to cover 200.96m^2. If he wants to put an umbre

Andrews [41]

Answer:

Step-by-step explanation:

area = πr² = 200.96

r = √(200.96/π) ≅ 8

The table is 8 meters from the edge.

3 0

3 years ago

. The National Sleep Foundation surveyed representative samples of adults in six different countries to ask questions about slee

scoundrel [369]

Answer:

Yes the conclusion in the question is a reasonable conclusion

Step-by-step explanation:

From the question we are told that

The sample size is $n_1 = n_2 = n = 250$

The sample mean for USA is $\= x_1 = 391 \ minutes$

The sample mean for Mexico is $\= x_2 = 426 \ minutes$

The sample standard deviation for USA is $s_1 = 25 \ minutes$

The sample standard deviation for Mexico is $s_2 = 49 \ minutes$

The null hypothesis is $H_o : \mu_1 = \mu_2$

The alternative hypothesis is $H_a : \mu_1 < \mu_2$

Generally the test statistics is mathematically represented as

$z = \frac{\= x_1 - \= x_2 }{ \sqrt{ \frac{s_1^2}{n_1} + \frac{s_2^2}{n_2 } } }$

=> $z = \frac{ 391 - 426 }{ \sqrt{ \frac{25^2}{250} + \frac{49^2}{250} } }$

=> $z = -10$

From the z table the area under the normal curve to the left corresponding to -10 is

$p-value = P(Z < -10 ) = 0.00$

Generally from the value obtained we see that

The p-value is < $\alpha$ hence

The decision rule is

Reject the null hypothesis

The conclusion is

The is sufficient evidence to conclude that adults in the United States get less sleep on work nights than adults in Mexico

Hence the conclusion in the question is a reasonable conclusion

6 0

3 years ago

after a 125% markup and a 10% discount the price of a watch is 30.78 before tax what was the wholesale price

Alekssandra [29.7K]

If an item is $15.20 is increased by 125% (34.20) it would be about $34.20 before we subtract 10% (3.42)....we arrive at the end cost of $30.78.

wholesale price would be 15.20

7 0

3 years ago