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lubasha [3.4K]
4 years ago
6

Can someone help me please

Mathematics
2 answers:
sertanlavr [38]4 years ago
7 0
Polygon with different measurements
Zigmanuir [339]4 years ago
3 0
I think it's: polygons with right angles
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List all x intercepts for y= -cos(1/2x + 1/5 pi) on the interval [-2/5pi,4pi]
Dahasolnce [82]
- cos ( 1/2 x + 1/5 π ) = 0 ( and because if cos α = 0, α= π/2 + k π, k ∈ Z )
1/2 x + π/5 = π/2 + k π,    k ∈ Z
1/2 x = π/2 - π/5 + k π  / * 2
x = π - 2π/5 + 2 k π
x = 3/5 π + 2 k π = 0.6 π + 2 k π
Answer:
If k = 0:  x 1 = 0.6 π = 3π/5
k = 1 : x 2 = 2.6 π = 13π/5
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4 years ago
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In a study of cell phone use and brain hemispheric​ dominance, an Internet survey was​ e-mailed to 2455 subjects randomly select
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Answer: 0.355,0.405)

Step-by-step explanation:

Given : Significance level : \alpha=1-0.99=0.01

Number of subjects (n) = 2455

Number of surveys returned = 931

The probability of surveys get return will be :-

p=\dfrac{931}{2455}=0.379226069246\approx0.38

The confidence interval for proportion is given by :-

p\pm z_{\alpha/2}\times\sqrt{\dfrac{p(1-p)}{n}}

0.38\pm z_{0.005}\times\sqrt{\dfrac{0.38(1-0.38)}{2455}}\\\\=0.38\pm(2.576)0.0098\\\approx0.38\pm0.025=(0.355,0.405)

Hence, the 99​% confidence interval for the proportion of returned surveys : (0.355,0.405)

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3 years ago
A ​$240 suit is marked down by ​%30. Find the sale price.
Margaret [11]

Answer:

Step-by-step explanation:fufufucu

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Write the ratio in fractional notation in lowest terms<br><br> 26 inches to 39 inches
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26/39=0.66666 or 2/3 you can divide 26 and 39 by 13 to get the simplified fractions. 2:3
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Hi please help me with my test ill give u brianliest
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