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harkovskaia [24]
2 years ago
9

Help me out with these two questions lol

Mathematics
2 answers:
Mashcka [7]2 years ago
6 0

Answer:

94.2 cm

62.8 inch

Step-by-step explanation:

The circumference of a circle is 2πr, where r is the radius.

The diamater is twice the radius, d=2r.

1) 2π·15 ≈ 94.2 cm

2) r = 10 inch. 2π·10 = 62.8 inch.

prohojiy [21]2 years ago
3 0
Here is the answer
94.2 cm
62.8 inch
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El área de un cuadrado es de 625cm. Averigua cuánto mide el lado y cuánto mide el perímetro del cuadrado
Rzqust [24]

Respuesta:

Largo del lado = 25cm

Perímetro = 100 cm

Explicación paso a paso:

Área de un cuadrado = L²

L es la longitud del lado del cuadrado

Dado

Área del cuadrado = 625sq. cm

625 = L²

L = √625

L = 25

Por lo tanto, el lado mide 25 cm de largo.

Perímetro del cuadrado = 4L

Perímetro del cuadrado = 4 (25)

Perímetro del cuadrado = 100cm

Por lo tanto, el perímetro del cuadrado es de 100 cm.

4 0
3 years ago
Read 2 more answers
Help!! 68 POINTS!! !!!!!! math!! look at picture!
-Dominant- [34]
Follow the a² + b² = c² formula

The hypotenuse always equal the c
a and b can be the other two numbers and are interchangeable

plug in 5 and 6 into a and b

(5)² + (6)² = c²
simplify
25 + 36 = c²
add
c² = 61
isolate the c, root both sides
c² = 61
√c²= √61
c = √61

Roots are Irrational numbers, and so D) irrational number should be your answer

hope this helps

<span><em>In loving memory of Malkea</em></span>
8 0
3 years ago
Read 2 more answers
19. If the polynomial P(x) = 27x^3 + 9x^2 – 3x – 10 is divided by 3x – 2, the remainder will be
aksik [14]

Answer:

D) 0

Step-by-step explanation:

Remainder is zero as 10 is fully divisible by 2.

<u>Proof</u>:

  • 27x^3 + 9x^2 – 3x – 10 = (3x -2) (9x^ 2 +9x+5)

<u>Correct choice is</u> D) 0

4 0
3 years ago
Find the work done in winding up a 175 ft cable that weighs 3 lb/ft.
nignag [31]

Answer:

work \ done= 45937.5

Step-by-step explanation:

Work done is given by

work \ done=\int_a^b w(d-x) \ dx , where d = length of cable and w = weight of cable.

Here, d = 175 ft and w = 3 lb/ft

Now, work \ done=\int_0^{175} 3(175-x) \ dx

work \ done= 3\left [175x-\frac{x^2}{2}  \right ]_0^{175}

work \ done= 3\left [175^2-\frac{175^2}{2}  \right ]

work \ done= 3\cdot \frac{175^2}{2}

work \ done= 45937.5

8 0
3 years ago
Trials in an experiment with a polygraph include results that include cases of wrong results and cases of correct results. Use a
hram777 [196]

Answer and Step-by-step explanation:

This is a complete question

Trials in an experiment with a polygraph include 97 results that include 23 cases of wrong results and 74 cases of correct results. Use a 0.01 significance level to test the claim that such polygraph results are correct less than 80​% of the time. Identify the null​hypothesis, alternative​ hypothesis, test​ statistic, P-value, conclusion about the null​ hypothesis, and final conclusion that addresses the original claim. Use the​ P-value method. Use the normal distribution as an approximation of the binomial distribution.

The computation is shown below:

The null and alternative hypothesis is

H_0 : p = 0.80

Ha : p < 0.80

\hat p = \frac{x}{ n} \\\\= \frac{74}{97}

= 0.7629

Now Test statistic = z

= \hat p - P0 / [\sqrtP0 \times (1 - P0 ) / n]

= 0.7629 - 0.80 / [\sqrt(0.80 \times 0.20) / 97]

= -0.91

Now

P-value = 0.1804

\alpha = 0.01

P-value > \alpha

So, it is Fail to reject the null hypothesis.

There is ample evidence to demonstrate that less than 80 percent of the time reports that these polygraph findings are accurate.

5 0
3 years ago
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