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3 years ago

Guys i am so confused right now??

Mathematics

2 answers:

pshichka [43]3 years ago

8 0

It is 42 7 * 6 = 42
it is right

Alexus [3.1K]3 years ago

3 0

Break it down into a half circle and a parallelogram. Then add the two areas together.

Circle Area= πr^2
Circle Area= (3.14)(7)^2
CA= (3.14)(49)
C Area = 153.94

This is a half circle so divide by 2:
153.94 ÷ 2= 76.97

Parallelogram Area= base x height
PA= 7 x 6
P Area= 42

Add the two areas together:
76.97 + 42= 118.9

ANSWER: D) 118.9 cm^2

Hope this helps! :)

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Four streets enter a traffic circle at points A B C and D name six arcs formed by the streets.

lilavasa [31]

Arcs are just sections of the circle
so lets say you had a pizza

and you put some points on the crust, the legnth of the crust from point to point is that arc

example
if you put poins A and B, then arc AB is the crust between points A and B

arcs can include other points as well
and arc AB=arc BA

so
I wil name easy arcs first
arc AB
arc BC
arc CD
ard DA

now ones that include others
arc AC
arc BD

so the arcs you might want to list are

arc AB
arc BC
arc CD
ard DA
arc AC
arc DB

5 0

4 years ago

Suppose we wish to demonstrate that there is a difference between the proportions of wives and husbands who do laundry at home.

maxonik [38]

Answer:

Step-by-step explanation:

From this study:

The null hypothesis:

$H_o : p_1 =p_2$

The altenative is:

$H_a : p_1 \ne p_2$

This test is a two-tailed test.

However; we are told that the wives have 44 success out of 66, then the number of failures will be 22.

Then;

$\hat p_1 = \dfrac{44}{66}$

$\hat p_1 = 0.6667$

Similarly, the husbands have 18 success out of 46, then the number of failures will be 28

Then:

$\hat p_2 = \dfrac{18}{46}$

$\hat p_2 = 0.3913$

The pooled proportion $p = \dfrac{18+44}{66+46}$

$p = \dfrac{62}{112}$

p = 0.55357

The estimated standard error S.E is:

$= \sqrt{\dfrac{ \bar p(1- \bar p)}{n_1} +\dfrac{ \bar p(1-\bar p)}{n_2}}$

= $\sqrt{ 0.55357(1-0.55357) \Big( \dfrac{1}{66} + \dfrac{1}{46} \Big)}$

$=\sqrt{ 0.55357(0.44643) \Big(0.01515 + 0.021739 \Big)}$

$=\sqrt{ 0.00911638798}$

= 0.0955

The Z test statitics can now be computed as:

$Z = \dfrac{ \hat p_1 - \hat p_2}{\sqrt{\dfrac{ \bar p(1- \bar p)}{n_1} +\dfrac{ \bar p(1-\bar p)}{n_2}}}$

$Z = \dfrac{0.6667 -0.3913}{0.0955}$

Z = 2.88

Th p -value from the test statistics is:

p-value = 2P(Z > 2.88)

p- value = 2 P (1 - Z < 2.88)

p-value = 2 ( 1 - 0.998)

p-value = 2 ( 0.002)

p -alue = 0.004

Decision Rule:

Thus, at 0.01 significance level, we reject the null hypothesis because, p-value is less than that (i.e. significance level)

Conclusion:

We conclude that there is a significant difference between the proportions.

5 0

3 years ago

myra swims 3/5 of a mile farther than luke.if luke swims 2 and 4/10 miles, how many milrs does myra swim?

Irina-Kira [14]

The answer is 447 because you got to add 35 plus 410

3 0

3 years ago

Would someone be able to answer this before 3 PM central?

Margaret [11]

Answer:

yes

Step-by-step explanation:

8 0

3 years ago

Two candidates ran for class president. The candidate that won received 80% of the 360 total votes. How many votes did the winni

erica [24]

To find the amount of votes that the candidate that won received multiply 360 by .8.

360*.8 = 288

This means the winning candidate received 288 votes.

6 0

3 years ago