2 years ago

Which polygon is a hexagon? A 5-sided figure. A 6-sided figure. An 8-sided figure. A 7-sided figure.

Mathematics

1 answer:

evablogger [386]2 years ago

6 0

Answer:

6-Sided Figure.

Step-by-step explanation:

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Expresión for the calculation 5 times the number 25 and then subtract the quotient of 14 and 7

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Answer:

(5*25) - (14/7)

<em>* means multiply and / means divide</em>

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2 years ago

Josefina works between 10 and 30 hours per week at a pizzeria. She earns $6.50 an hour, but can earn tips when she delivers pizz

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a, 6.50h=d

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2 years ago

Teams must win at least 25 games. So far, the volleyball team has won 21. Describe the graph of an inequality showing how many m

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2 years ago

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Find c, yenvelope(x,t), and ycarrier(x,t). express your answer in terms of a, k1, k2, x, t, ω1, and ω2. separate the three parts

steposvetlana [31]

Answer:

$C,Y_{envelope}(x,t), Y_{carrier}(x,t)=2A, \cos ((k_1-k_2)x/2-(\omega_1 -\omega_2)t / 2 ) , \sin ((k_1+k_2)x / 2 - (\omega_1 +\omega_2)t / 2 )$

Step-by-step explanation:

Given

$Y_1(x,t)=A \sin(K_1x- \omega _1 t)\\\\Y_2(x,t)=A \sin(K_2x- \omega _2 t)$

using a trigonometrical identity

sin p + sin q = 2 sin ( p+q/2) cos ( p-q/2)

and here the condition is

the choice is in between sinax and cosax

where a > b

so we get using above equation

$C,Y_{envelope}(x,t), Y_{carrier}(x,t)=2A, \cos ((k_1-k_2)x/2-(\omega_1 -\omega_2)t / 2 ) , \sin ((k_1+k_2)x / 2 - (\omega_1 +\omega_2)t / 2 )$

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2 years ago

Based on FAA estimates the average age of the fleets of the 10 largest U.S. commercial passenger carriers is 13.4 years with a s

Sliva [168]

Answer: 0.0129

Step-by-step explanation:

Given : Mean : $\mu=13.4\text{ years}$

Standard deviation : $\sigma=1.7\text{ years}$

Sample size : $n=40$

Let X be the random variable that represents the age of of the fleets.

Z-score : $z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

For x = 14

$z=\dfrac{14-13.4}{\dfrac{1.7}{\sqrt{40}}}\approx2.23$

By using standard normal distribution table , the probability that the average age of these 40 airplanes is at least 14 years old will be

$P(x\geq14)=P(z\geq2.23)=1-P(z$

Hence, the the probability that the average age of these 40 airplanes is at least 14 years old =0.0129

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2 years ago