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s344n2d4d5 [400]
3 years ago
5

I need help I have no idea what to do

Mathematics
2 answers:
In-s [12.5K]3 years ago
6 0

Answer:

1) ∠A = 90º   Square

2) ∠A = 140º Parallelogram

3) ∠A = 90º   Rectangle

4) ∠A = 95º  Rhombus

5) ∠A = 60º Trapezoid

6) ∠A = 41º Parallelogram

Step-by-step explanation:

There just some points I want to state:

Rhombus  is a quadrilateral with all sides being equal and opposite sides being parallel.  Also, the opposite angles are equal, and the the diagonals bisect each other at right angles (90º).

In order to find the angles, just consider:

Sum of internal angles = 360º

You may also note the complementary and supplementary angles.

vivado [14]3 years ago
4 0
Which one do you need help with?
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Harold works at a men's clothing store which marks up its retail clothing by 27%
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Wheres the question?
8 0
3 years ago
A Pew Internet poll asked cell phone owners about how they used their cell phones. One question asked whether or not during the
EastWind [94]

Answer:

a) \hat p=\frac{471}{1024}=0.460

The standard error is given by:

SE= \sqrt{\frac{\hat p(1-\hat p)}{n}}=\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0156

And the margin of error is given by:

ME=z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}=1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0305

b) The 99% confidence interval would be given by (0.429;0.491)

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

Data given and notation  

n=1024 represent the random sample taken    

X=471 represent the people responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering

\hat p=\frac{471}{1024}=0.460 estimated proportion of people responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering    

p= population proportion of people responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering

Part a

The confidence interval would be given by this formula

\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}

For the 95% confidence interval the value of \alpha=1-0.95=0.05 and \alpha/2=0.025, with that value we can find the quantile required for the interval in the normal standard distribution.

z_{\alpha/2}=1.96

The standard error is given by:

SE= \sqrt{\frac{\hat p(1-\hat p)}{n}}=\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0156

And the margin of error is given by:

ME=z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}=1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.0305

Part b

If we replace the values obtained we got:

0.460-1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.429

0.460+1.96\sqrt{\frac{0.460(1-0.460)}{1024}}=0.491

The 99% confidence interval would be given by (0.429;0.491)

8 0
3 years ago
Given a circle with a radius of 0.85 meters, find the area of 1/3 of the circle. Use 3.14 for pi and round to the nearest hundre
olga_2 [115]
1/3 x pi x radius squared 
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0.76 to nearest hundredth 
7 0
3 years ago
Read 2 more answers
A bag has 9 blue marbles, 7 red marbles, 4 green marbles
scoundrel [369]

Answer:

7/25

Step-by-step explanation:

First we need to determine how many total marbles

9blue+7red+4green+5purple = 25 marbles

P(red) = red/total

          = 7/25

7 0
3 years ago
Read 2 more answers
60% of 10 help me ///////////
balu736 [363]
So 60% = 3/5 
All you do is 3/5 x 10 = 30/5 and get 6
6 0
3 years ago
Read 2 more answers
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